HOW TO USE A SLIDE RULE (C&D SCALES) ANALOG COMPUTER MULTIPLICATION & DIVISION 99134

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Produced by the United States Office of Education, this vintage film shows the operation of the slide rule with focus on the 'C' and 'D' Scales.
The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer. As graphical analog calculators, slide rules are closely related to nomograms, but the former are used for general calculations, whereas the latter are used for application-specific computations.
The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms, and trigonometry, but typically not for addition or subtraction. Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines.
Slide rules exist in a diverse range of styles and generally appear in a linear or circular form with a standardized set of markings (scales) essential to performing mathematical computations. Slide rules manufactured for specialized fields such as aviation or finance typically feature additional scales that aid in calculations particular to those fields.
At its simplest, each number to be multiplied is represented by a length on a sliding ruler. As the rulers each have a logarithmic scale, it is possible to align them to read the sum of the logarithms, and hence calculate the product of the two numbers.
The Reverend William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier. Before the advent of the electronic calculator, it was the most commonly used calculation tool in science and engineering.[8] The use of slide rules continued to grow through the 1950s and 1960s even as computers were being gradually introduced; but around 1974 the handheld electronic scientific calculator made them largely obsolete and most suppliers left the business.
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6 авг 2019

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Комментарии : 418

@fepeerreview3150 2 года назад

I really like these old educational films. There's no attempt to "entertain". There's no sense of a need for it. They were content simply to educate and people watching were content simply to learn. It encourages a different kind of disciplined mental focus.

@destubae3271 Год назад

Agree. It almost feels like they're trying to fight for the attention of students by flashing colored keys in front of them

@pyropulseIXXI Год назад

This is superior. I hated when people tried to make learning entertaining. I'm learning because I enjoy it and want to learn, so injecting 'entertainment' just dilutes the learning process, ruins everything, and produces a mere illusion of understanding, as literal id**ts think "Wow, I'm enjoying learning when I otherwise wouldn't have. This means I actually learned something!" It is a method employed by charlatans in order to get 'butts in seats,' and then the goal is to make the person feel as if they learned something with no regard for actualities

@justanotherguy469 Год назад

@@pyropulseIXXI Amen Brother! Everything has to be "cool" now.

@CorvinusIratus Год назад

My sentiments exactly. I've found the same sort of pleasure in old textbooks - the focus is on straightforward knowledge transfer without fancy graphics, unnecessary pictures, insets and all the other trappings of modern works. On top of that they are so much better written.

@neilfurby555 Год назад

Absolutely right, super lack of drama and theatre, just good well described content.

@fieryweasel Год назад

In high school (late 90s) we routinely had "no calculator" math tests. I brought in my dad's bamboo circular slide rule and asked if I could use it; the teacher, assuming I had no idea how it worked, said that would be fine. It certainly made the tests a lot easier.

@drewkoenen8334 Год назад

Eeeek I learned to use the slide rule in high school. Nightmares galore

@commentorsilensor3734 Год назад

Back in 80s, 2 math teachers for adults us to use calculators. Period. One gave us trigonometry tables. Of course, the math tests were always sin 35.5. We had to do interpolation. One time she gave us the values of 2 to 10 and 2 to 20. Nice, the questions are 2 to 12 n 2 to 22. It's good. We need to learn basic math operations. We don't need to learn redundant math, such as wasting time finding out 2 to 22, but 2 to 20. Back to slide rules, those two would forbid. One teacher who allowed calculators was never good in teaching. He was good in math. He earned master in math at UCLA. He was a lecture at a state university. He didn't get tenure because he didn't have PhD. He was forced to teach at high school because of job. Everyone hated him because he was not serious in teaching. Many girls liked him because you know what. Oh, he loved to brag his life. One time he brag slider backn8n his high school days. The bell rang. He said he would continue his story the next day. We said no. He can share his slider story with female students.

@ObiWanBillKenobi Год назад

Cool story, bro. 😎

@himoffthequakeroatbox4320 Год назад

Similar time, we did them as they illustrate how logs work, and in case your calculator ran out of coal. My uncle was a retired engineer and he taught me before that. Remember the books of tables?

@johnnolang3734 Год назад

Circular slide rules are certainly better by far. I still have and use one because you can drop in on the floor more times than you can an electronic calculator. Given their rarity, it may have been the teacher who didn't have a clue what it was.

@petepal55 4 года назад

Still have mine, waiting for that EMP pulse, lol. Oh wait, I have a pacemaker. Never mind.

@icontrolthespice 4 года назад

LMAOO

@rickb1973 3 года назад

Not even going to abbreviate letters to indicate my deep and appreciative laughter......Holy heck, man....That was a good one.

@zerolatitude2923 3 года назад

Pete, I just spit up whiskey through my nose. Yeah, would be a heck of a way to go, see the transformers popping and then WHACK... hey not a bad way to get of this rock.

@samisiddiqi5411 2 года назад

Kek'd

@MyTubeSVp 2 года назад

LOL

@deadfreightwest5956 4 года назад

I had a slide rule once, but never learned how to use it. Now I need to get one and study it. All of our greatest engineering feats were won with the slide rule. The power of logarithms!

@cannonrogmatt 4 года назад

Dead Freight West I have a old book on logarithms. While I was in engineering school in the late 60’s this was the way it was done no calculators

@SciHeartJourney 2 года назад

So you're depending upon the internet to teach you in the event it goes down for good, right? That's my plan too! I kid, but I love the "no batteries" computing power, if you know how to use it.

@johngood8107 Год назад

Same Here!

@mattsadventureswithart5764 Год назад

I have a collection of them, varying in size and number of additional scales, but my favourite is a little circular one that's about 100mm across.

@Treblaine Год назад

Time to invest in a faraday shirt.

@ronaldmcyr156 Год назад

As a chemistry undergrad and grad student in the 60s, I used my K&E slide rule every day. It's a great tool if you are OK with 2 significant figures accuracy. The first HP scientific calculators that came out in the early 70s made the slide rule obsolete; however, they cost a month's wages for a grad student at the time.

@jeffrankin967 Год назад

My first calculator was a Texas Instruments. I'm thinking it cost something like. $125 - $150

@brucelawson3226 Год назад

About 20 years ago we had friends over for dinner. Their daughter was a high school math scholar. She understood logarithms but had never seen a slide rule until I showed one to her. I will never forget her reaction "This is so cuuuute!" If I remember correctly, I gave it to her and she was thrilled.

@melody3741 Год назад

I know you guys are just preserving history here, but these old tutorials are pretty damn helpful

@wilhelmtaylor9863 Год назад

I attended University at the transition of slide rule to scientific calculator in the late 1970s. The HP35 was a pivotal event in engineering and presaged a tour de force for ALL engineers in accuracy, speed and access to mathematical results. The slide rule had its day. I was glad to have been part of its hayday and glad to have seen it pass.

@mattsadventureswithart5764 Год назад

I'm glad their day has passed, because it means I can add some very nice slide rules to my collection for very cheap

@richanthony5255 Год назад

TI SR50 was my first.

@robertromero8692 Год назад

Yes, I remember that era. The HP 35 was a source of tremendous fascination.

@drewkoenen8334 Год назад

Hmmm if I remember 8 k memory chips

@PAHighlander24 Год назад

I was in engineering school 1971-1975, when the Texas Instrument SR-10 came on the market - basic math functions with squares and square roots, and no trig functions. You could always tell who the engineering students were - slide rules in holsters from our belts. When the SR-10 first came on the market it sold for $200! Within a year it sold for less than $50, and then competition from HP with many more functions became the standard. Most of my professors banned the TI the first year, as not all students could afford them. I still have my slide rule, and show young people how it works, and they're always amazed. I tell them to watch the film Apollo 13, and see the engineers in the flight control center in 1970 grab their slide rules when the emergency happened and they needed fast calculations.

@williamjones7163 Год назад

I graduated high school in 1978. I had a chemistry teacher that taught/required students to use a slide rule. His rationale was that not everyone had a calculator but everyone would have a slide rule because the school would provide them.

@nickjung7394 Год назад

Got that wrong then!

@francoamerican4632 Год назад

By 1978 the public schools in my area weren't even providing pencils and paper due to budget cuts.

@dsramfam Год назад

I still have several of my slide rules from high school and college, and remember how to use *most* of the scales. We had to take a 6-week course on using a slide rule when I was a freshman engineering student at Iowa State University in 1970. This was around the time the first electronic calculators were coming on the market, and a kid in my dorm loaned his out so we could check our work for the class. I remember the scene in Apollo 13 that showed the flight controllers using slide rules.

@AlRoderick 2 года назад

This really makes you understand why scientific notation is the way it is. It turns all numbers into a simple slide rule multiplication of two numbers between one and ten and a number of zeroes to add and subtract.

@robertromero8692 Год назад

That's not the true reason for using scientific notation. It's actually a way to express very large or very small numbers (such as Avogadro's Number or the mass of a proton) in a convenient form. All measurements have limited precision.

@gabedamien Год назад

@@robertromero8692 even more than that, it's also a way to make very explicit whether trailing zeroes are significant (instead of placeholders). With 10,000 it isn't clear if the precision is 1*10^4, 1.0*10^4, 1.00*10^4, 1.000*10^4, or 1.0000*10^4. But with scientific notation, it is - as just illustrated in the previous sentence!

@Forensource 2 года назад

I used a slide rule in 1975 or so in grade school. The classroom had a gigantic one on the board-six or eight feet across. Never really learned how to use it. Thank god, my new slide-rule has a usb 3 port.

@pyropulseIXXI Год назад

I've been using my slide rule lately, as I lost my calculator. These things are amazing and one can get quite quick at using it to great precision

@wombatburrito5896 Год назад

This is the content we need on day time television. These videos should be shown in school

@ImSquiggs Год назад

Fascinating piece of technology. Computers are a wonder on the level of magic that’s hard to comprehend sometimes, so it’s a real treat to see a physical object that can take on some of their functionality so eloquently.

@demef758 4 года назад

Once you understand logarithms, and many slide rule users do not, you understand that log (a*b) = log(a) + log(b) Division is log(a/b) = log(a) - log(b) Thus, multiplication and division are solved on the slide rule by addition and subtraction. That's what you're doing on the slide rule: adding and subtracting LENGTHS on the two scales. You will note that the slide rule scales are marked in logarithmic distances, not linear distances. You then need to learn about exponents so that you can learn to express any number as A*10^(x), where A is a decimal number between 1 and 10, and X is the power of ten needed to complete the number. Thus, 400 = 4*10^(2). Now when you multiply 400 * 2000, you first break it down as follows 400 * 2000 = 4*10^(2) * 2*10^(3) = 4*2*10^(2+3) = 4*2*10^(5) You then use the slide rule to calculate 4*2, and when you're done, you have the answer expressed in "scientific notation." When learning exponents, you learn now to manipulate exponents, too. What stops many users in their tracks is when you have fractional exponents, such as 10^(4.27). "What the heck does that mean?!" This is why you *should* have been paying attention in high school when Mr. Smith was trying to teach you math!

@Adam-vj7dn 2 года назад

Thanks for this comment, from someone who didn't pay attention in high school math

@pyropulseIXXI Год назад

No teacher ever taught me math, because that is for idiots. If you teach yourself, the difference between a great teacher and a bad teacher becomes irrelevant; that is, a great teacher and bad teacher become equivalent, as both are irrelevant to one's learning, and both teach at a rate so slow as to be mind grating high school was lame af, because they teach you as if you are a literal 5 year old. Everything is slow, everything is graded based on homework and binder checks, and every teacher is a literal moron. Mr. Smith was less intelligent than I was when I was 10 years old School is as a massive waste of time, but I do not agree with the other type of people that think RU-vid videos are better. That is even dumber. I taught myself everything, even in college. College was a massive disappointment, because I thought things would finally pick up and be serious. Nope. 95% of stuff I learned was on my own, with a measly 5% being from the college courses. That means if I just learned what college taught me, I would be a massive moron lacking 95% of stuff I currently know and understand. That is why I don't get people that graduate college and think it means something, especially when they barely passed. College is the BARE MINIMUM of what one should know. A degree means "I know the bare minimum, of which a 14 year old could've taught themselves, but since society is so dumbed down, this is considered an achievement.!" My degree was in physics and mathematics (double major), I never felt like college was worth my time until I took my first graduate course as a junior

@Perktube1 Год назад

I've never had to use fractional exponents in life, but it is interesting.

@michaelball4907 Год назад

And my math teacher, who was fantastic was actually Mr Smith😊

@SeeJayPlayGames Год назад

I understand logarithms, but I don't need a slide rule to calculate 4*2. This seems unnecessarily complex and primitive at the same time. I'm glad I didn't grow up having to use these contraptions. edit: I did have a ruler that also had a slide rule metric converter. But I never had or used a TRUE slide rule, like for actual math.

@randallulrich 2 года назад

Learned to use an abacus for math class in the '60s. Learned to use a slide rule in the '70s. Learned to use a circular slide rule (a "whiz wheel") in the '80s as a navigator in the USAF (I still use a whiz wheel as a civilian pilot). Using that circular slide rule, I could often calculate a mathematical problem faster than when using an electronic calculator. I still have a slide rule and a whiz wheel.

@doctorlarry2273 4 года назад

Yep - still have several from college days. I actually keep one in my workshop since it can be faster for many problems than a digital calculator and the batteries never run down. My favorite is my aluminum circular slide rule that I got during Engineer Officer Basic Course at Ft Belvoir. Fit in my shirt pocket and very sturdy and definitely waterproof!

@shakeydavesr Год назад

Hey, Ft Belvoir,, I grew up down the rd from there. Grandfather retired from there after lord knows how many years of civilian worker for Corp do Engineers.

@bradjordan5763 Год назад

I am 11 years old and because of this video I now know how to use a slide ruler

@CraigLumpyLemke Год назад

Good job, little math man!

@Mark_Ocain 4 года назад

I still use a form in aviation..the E6B flight slide rule - great little thing. Standard slide rules were bread and butter for complex problems calculations up til the mid 60's..you'd always find an engineer with a pocket protector full of pens and a slide rule on his person LOL

@brunosmith6925 Год назад

I've had my slide rules (both a rectangular one and a circular one) for just over 50 years and on occasion still use them for a quick calculation. My colleagues have no idea what I'm doing and seem intrigued by my capacity to work out calcuations using a device more common to enabling straight lines to be ruled with a pencil across a piece of paper.

@dayneallensheetsftm Год назад

My first 'calculation' tool was a slide rule in Jr and Sr High school in the 60's. In 1970, my first year in college, rehargeble calculators started being sold. They were expensive so some students had them and most couldn't afford them. Since everyone couldn't afford one, we were only allowed to use slide rules for exams such as in chemistry and mathematic classes My dad had worked as Head Pasturizer for Carnation Milk Co. and had one. My mom and I got daddy a beautiful pocket glass and metal one for Fathers Day when I was 8 years old. It was in a leather pocket clip on case. I had a large plastic one in high school and when I graduated he gave me his. It's gorgeous and 52 years later ( it's 60 now) I still have and use it. I keep the slide clean and the leather well cared for. My dad has been gone 20 years now but it keeps his memory alive for me each time I use it.

@dysfunctional_vet Год назад

it was after my divorce i decided to take up sailing again. since it had been 25 years since i hand walked a rolling deck, i started at the basic. in my study of life boat navigation the author strongly encouraged the use of a slide for star reductions. i had forgotten what i knew about it so this fillm proved to be amazing and to the point

@user-lv1jk9qb9t Год назад

did you marry again?

@DJ_Cthulhu 4 года назад

Got a slide rule as a birthday present in 1974. Still using it. 🙂

@rheffner3 Год назад

When I went to college in the 60's you had to have a slide rule. I was so proud to get my first one. Had a holster to hold it in. Took a one credit course to learn how to use it. Fantastic. Of course, the electronic calculator came along not long after and that was the end of the slide rule.

@tcolon5088 Год назад

Same here, great science was done with it !!!

@schroedingersdog7965 Год назад

I once owned a cylindrical slide rule. The "C" and "D" scales were wrapped helically around cylinder and were both about six feet (1.8 meters) long, . It gave one significant digit more than the usual straight or circular rules.

@sebastien3351 4 года назад

After watching this video I had warm memories so, I pulled out my old K&E slide rule I used in college back starting in Sept. 1962!

@rudybreuker Год назад

1968, my first year in high school. I had my table books and ….. my slide rule in my bag. Oh i was a proud man. I am now retired 68 and have him stil. It is a treasure of the past.

@jimparsons6803 Год назад

I recall using slide rules. Got my first one as a Christmas present when I was about 14 years old from my Parents. Little did I know, at the time, what an incredible tool it was. And that they were setting up for my Sister and I expectations. Most other kids our age did not receive such presents nor expectations, I thought that was pretty profound I deduced later in life.

@NetMaestro2009 Год назад

I am of the baby boomer generation. We have seen the phenomenal changes and transition (and use) of technology from slide rules to calculators to mainframe to personal computers to smart phones. I am glad to have been part of that generation.

@prsearls 4 года назад

Wow. I haven't seen a slide rule instruction for nearly 60 years. I'll have to see if I can find mine from college and my Dad's slide rule. He was an expert using his. It's amazing what technological progress and inventions engineers built using these simple devices and a no. 2 lead pencil (and intelligence). Take away our computers, smart phones and the internet, and watch civilization crash.

@thomasgoodwin2648 Год назад

no. 2 pencil? Try "Manual Graphite Display Generator". 😉

@prsearls Год назад

That’s good, Thomas. My wife and I got a laugh from your description. It sounds like something the government would say.

@peterparker9286 Год назад

Secondum. It was said that Kelly Johnson used the Michigan slide rule to develop the Black Bird.

@Perktube1 Год назад

True, but computers and phones are bringing this video to me so I can learn, like learning how to tie certain knots in paracord and bank line to make camping more fun and useful.

@prsearls Год назад

I agree. The educational content of platforms like RU-vid cannot be overstated.

@Sorarse Год назад

When I was at school, electronic calculators weren't a thing, so the slide rule was a common instrument we all used in lessons that required any sort of calculations - maths and technical drawing in my case.

@robertdeland3390 Год назад

As an engineering student in college from 1959 through 1964 I had a slide rule hanging from my belt on campus every day! I could and did use other scales, including trig scales. Several years after graduating, HP came out with the first scientific calculator. It was a game changer. There are still some benifits to the sliderule. You don't just get an answer, you can see a range of answers.

@Steve-uu7yx Год назад

Ive read tons of different explanations for slide rulers and this finally clicked!

@emanuelmifsud6754 Год назад

I learnt all of this in 1972 Australian in second form high school, 14 years old, still have the slide rule and log tables. At the same time electronic calculators were comimg out. We eventually just used electronic calculators. You can be faster then a person on a calculator if you know how to use the slide rule efficiently.

@edwardliquorish8540 Год назад

Buckley Park.

@bowl1820 2 года назад

I'm sitting here with my slide rule (a Pickett N903-T) getting the feel back for using it. People using basically just a pad of paper, a pencil and slide rule sent people to the moon.

@lawsontroya Год назад

I was in my freshman year in 1976. I was in Jr. High in 1974. We had no slide rules or calculators in Jr. High, but had logarithmic scales in the back of my math book in 7th grade. Calculators were big and bulky and very expensive. Eventually we were allowed the use of calculators in math class in high school. I was always in the ‘dummy’ math class in high school. When I went to community college the year I graduated high school, I was made to take the whole series of math classes from the beginning at 8:00AM five days a week the whole time. I wound up taking two semesters of Calculus and after that I said I was done.😂🎉 I am glad I did.

@RTWest-kn5fr Год назад

NOV 1971 to MAY 1972, Navy Nuclear Power School, Bainbridge, Maryland. We used a slide rule everyday like the one shown at the opening of this video. Back then, a simple add, subtract, multiply and divide Sears calculator cost more than we made in a month. All homework quiz and exam work was done with the slide rule. We never lost a sub or melted down a power plant. Old Navy... the real Navy! Go Navy! RT sends, Puebla, México...

@PeriscopeFilm Год назад

Thanks R.T., love this kind of comment. Please become a sub! And -- thanks for your service to our great nation.

@BrilliantDesignOnline Год назад

There were hardly any explosions or kittens in this video. Good refresher. If you can do this, you can do metric.

@thomaschristopher8593 Год назад

used it for the last 2 years of high school. then calculators went on the market and it's been in my desk drawers since 1974.

@norwegianwiking 4 года назад

And that's all you need to get to the moon.

@thomash4578 4 года назад

A rocket helps

@phantomcruizer 4 года назад

And a billion dollars 😏

@wwilcox2726 2 года назад

@@thomash4578 🤣🤣🤣

@warreneckels4945 2 года назад

Actually, computers were used as well as the slide rule. (I believe they were MODCOMPs)

@peterparker9286 Год назад

@@thomash4578save yoir money. ALL they found was some Rigolith and Empty Royal Crown Soda Can.

@specialservicesequipment393 Год назад

I have a bunch of slide rules I picked up from antique stores, and at online auctions. I just can't see such a valuable tool disappearing into obscurity.

@danielgoodman3578 Год назад

I was today years old when I learned some about how to use a slide rule. Neat tool! I can see how it relies on the user to exercise understood principles of how the numbers work the same regardless of how many times each part of the problem is multiplied or divided by 10. Like you can't use this without having some math under your belt already.

@tomwestbrook Год назад

The slide rule went out of use by the time I got to college in ‘80 but I still owned one (long gone). The big thing when I took engineering classes were the HP scientific calculators like the 41cx.

@getplaning Год назад

We were taught to use slide rules in school, before calculators were a thing. I still have mine, in a leather case. Now I will get it out and learn how to use it again.

@alexzinovenko1898 Год назад

I had a slide rule in the 60s and 70s. I remember taking the SAT and ACT tests with it. I wish they were still sold. I buy one.

@mikewilley5678 4 года назад

Four years of Engineering school with my K+E. Still have it...

@timsmith2525 Год назад

This is the clearest explanation of a slide rule that I have ever seen!

@HarryWHill-GA Год назад

I learned slide rule on, and still have, my father's circular slide rule which he used in the Korean war. I was in college before hand held calculator's were even an expensive toy. A TI-95 was over $800 in the mid-70s so I made do with my slide rule. We had a TI-95 on my first ship for handling some ASW calculations.

@Dadzilla2 Год назад

Graduated high school in 79, and yes we learned our electronics using the slide rule. Still have mine.

@KensSmallEngineRepair 4 года назад

Brings back memories

@rager1969 Год назад

I always wondered how to use a slide rule, but before Google (much less RU-vid), there was no easy way for me to find out. Then I forgot about it. Now, some 30 - 40 years later, I have a basic understanding. Thank you.

@GroverCricketDaisy Год назад

Fantastic I am getting allot out of these training videos enjoying the older technology

@southernflatland Год назад

Well today I learned that they invented the mouse cursor way before they invented the mouse. And hell, the cursor even had relevant rotating pointer animations! Awesome, thanks for sharing 👍

@NM-ql9er 3 года назад

Thanks for this. Just got a slide rule. I can't wait to start using it more.

@dathyr1 Год назад

LOL!!!!! I used to be a wizard on the Versalog slide ruler back in the late 1960's in my college Electronics classes. I think I still have mine somewhere. Probably couldn't use it now. Then the HP-35 scientific calculators hit the market. I was one of the first students to get one of these in my classes. Made my tests in school a breeze. Those were the years.

@thetoecutter13 Год назад

Found a couple of slide rules in a toolbox at work. I'm a machinist, and the shop I work in has been around since the 60., I take the sin and cos buttons on my calculator for granted.

@rohnkd4hct260 Год назад

Thanks for the memories ! Have not used one in years.

@TheJoyfulEye Год назад

We used to have slide rules in high school. Mine was yellow plastic. I wish I had kept it, just as a souvenir of bygone days.

@SendNubes96 Год назад

Something about this guys voice= almost instant understanding regardless of context

@Paul-in-Missouri 4 года назад

Still have my K&E slide rule from Navy ET school. I loved using the slide rule.

@edwardpate6128 4 года назад

Former ET here too but by 1980 we were using calculators. When I was in NPS though some folks still using them. I still have a couple from when I was in high school.

@Paul-in-Missouri 4 года назад

@@edwardpate6128 I was a CT at GL ET school in 73. Calculators were out but VERY expensive. The slide rule I bought ( a very good K&E) was way cheaper and just as fast once you got familiar with it. It did take practice. The downside is the positional accuracy.

@Halli50 Год назад

An old-school dive into the decimal system, analog version. Do you 'Muricans realize that THIS is what the metric system is based on, what is left out are the suffixes - the K (kilo) for 1000 and C (centi) for 100, m (milli) for thousands etc? Just moving the decimal point around as required. Using the slide rule very quickly became intuitive. I lived through the transition from the slide rule to ever more sophisticated digital calculators in the late 1970s. One pro of the slide rule is that it never runs out of battery power, even if you leave it in a drawer for years! It is always ready for action.

@haroldishoy2113 Год назад

I use specialized versions of slide rules in calculating the exposure time for industrial radiography and industrial ultrasonic inspection.

@davidschmidt8553 Год назад

I'm probably a member of the last generation to learn how to 1) use a slide rule, 2) create engineering drawings on a drafting board, and 3) program a computer that used punch cards. Now I use a SwissMicros RPN calculator, various CAD packages, and C++. I still like slide rules, though. A few years ago I started collecting them, and I take them out periodically just to mess around with.

@Songblade001 3 года назад

😎 Look I have a stick! 🤨 Big Deal 😎 I made some marks on it 😳 now we can go to the moon It’s so amazing that so much has been accomplished with such a simple tool.

@jeopardy60611 Год назад

I find this fascinating, because I attended high school and college from 1984-1992 and was in the calculator age. My high school physics classroom had a large slide rule on the wall, which was left over from the slide rule age. It's interesting to discover how a slide rule works, but I'm glad I can use a calculator, because I am visually-challenged and would find the scales hard to see.

@keithwalker6892 Год назад

I worked as an aircraft Stressman for many years .T he main problem with the slide rule was the decimal point. An easier explanation of the working of the slide rule was that it added logarithm’s to multiply and subtracted logarithm’s to divide. The spaces on the slide rule was the logarithmic numbers.

@ScootZMedia Год назад

I wish people still spoke like this.

@markjohansen6048 Год назад

I was searching through a drawer of old stuff and found an old slide rule. I haven't used it in about 40 years. But if all the calculators and computers in the world disappear, I'm prepared!

@ayebaby1438 10 месяцев назад

Thank you very much for posting this I found a antique slide rule and couldn't find a video with the one like mine until I came across this video I wish we could go back in time before we live in a world of dumb people with smartphones we're headed towards idiocracy 😢

@terrynorlo3196 Год назад

Going to school, in the 70's we had to learn this & tested on it, Have our own. My 7th grade son, took his to a math test, the teacher didn't know what it was & that's a shame.

@mikejacobson14 Год назад

They're very deliberate in their instruction and assume that the student is able to reason.

@vittalrao7816 Год назад

My older brother used to use the slide rule in his engineering school and later on in his employment in an aircraft factory. Now I know how it worked.

@VoidHalo Год назад

Heh I found my Da's old sliderule from when he was a surveyor. It didn't take me long to figure out how to use most of the rules. But it was missing some of the more fun ones, like trig functions for some reason. My Mum also had an odd slide rule that was a disc rather than a ruler shape. It still had the clear slidey window on it and worked exactly the same. But it was actually compact enough to fit in your pocket, which must have been nice in the 70's.

@hpblack1953 Год назад

In ‘70-‘72 a slide rule was required for electrical engineering classes. I had a Pickett. Moat of us became quite proficient using the slide. A few years later TI introduced the portable/battery calculator. Previously I had to use my brain. With the calculator I only had to use my fingers.

@gsdauria Год назад

Same here I remember the fad was to get the HP hand held scientific calculator. I was working at a facility in California and was asked "what's 10% of such and such" the first thing I did was reach for my calculator. Then I realized I was to dependent on it.

@flybobbie1449 Год назад

Beauty of slide rule over calculator is all the alternate values are shown for various questions. Pocket calc. only gives one answer per question. Not until computers could many alternates be shown, provided someone wrote the program.

@tomv4408 Год назад

Interesting video. Never had to learn to use a slide rule. You still needed to know your math, though. Btw, I think this is the first comments section I've seen where people post formulas. Very cool!

@johnbutler4631 Год назад

I'm not from the era of slide rules, but my Dad was. I got interested in them as a math teacher about 15 years ago. I've made some out of paper and cardstock, and I've bought a few.

@johnanthony6092 Год назад

When I did my maths O'Level in 1976 we weren't allowed to use calculators, we had to show our working out by hand. In some of the questions we were instructed to work the answer out to slide rule accuracy.

@rcnelson Год назад

Caught the end of the slide rule era when a stationery store closed out its inventory for 10 cents on the dollar. Got a beautiful, decked out rule in a leather case for next to nothing.

@egberthigglewonk4520 Год назад

I remember back in high school (1979-ish) some slide rule nerds had a "race" with a couple of Japanese exchange students with a soroban. The exchange kids won something like 8 in a row!!

@Greebstreebling Год назад

I'll have to crack the old slide rule out again. It was great fun in the days when I last used it (1972). Although if I could have watched this video in those days, I feel I would have died before I got to the solution of 2x2.... :) :)

@shaider1982 Год назад

Nice, I still have my uncle's slide rule. I can follow this video for its use.

@MIKEx2112 14 дней назад

amazing how simple this device really is

@paulwarner5395 Год назад

Thanx for the video. Last time I used a slide rule was in the mid 1970s and then calculators came along. I still have one somewhere..

@orionred2489 Год назад

Inherited a pocket slide rule from my father in law. It's a cheap slip of plastic and has a paint store ad on it. It was swag from the 60s or 70s and he would use it to calculate how much paint was needed, or how to mix certain proportions. It only has the basic scales on it for add/subtract multiply/divide, and you'd be lucky to get three significant digits off of it. It's a real time capsule for how everyone knew how to use them back in the day though.

@dbx1233 2 года назад

What an interesting old artifact. There was no mention of battery installation or even battery type. This thing has to be getting power from somewhere.

@esoxlucius6884 Год назад

When I went to tech college in 1971, I bought a British Thornton slide-rule in a plastic case.

@robmclaughjr Год назад

Sliderules are awesome and should be required in schools. Understanding their workings requires applied knowledge which is sorely missing today.

@TheGovernancePage Год назад

The scale appears logarithmic, love it! I wonder if it could calculate logs... don't think I would ever be in a situation to use this so great video, thanks!

@onradioactivewaves Год назад

Probably rolls down the stairs, alone or in pairs, and over your neighbors dog.

@johnskuttysabu7915 2 года назад

Well explained old video on slide rule...

@rikki-tikki-tavi2456 Год назад

This may seem dry to some, but it is a great way to learn. No politicts or useless social justice garbage interfering with education. This was back when education wasn't indoctrination. There was a no nonsense approach to teaching students how to think logically.

@richarda.valdes1197 Год назад

My father was a Master Tool and Die Maker and I use to watch him use his slide rule while working. I did simple math problems just to get the feel of using the slide rule but never to the degree of these true Masters.

@Faronthefiddler Год назад

A Slide Rule, keeps the brain sharp.

@larryrubin1718 Год назад

I remember the transition from slide rule to calculator. Hugely expensive slide rules costing 100’s of dollars landed up in the bargain bin of the university for 1.00 a piece. No one bought them 😮.

@ReginatorNet Год назад

Slide rules require a fair bit of intelligence and discipline - I like it!

@jbennettutm Год назад

Slide rule is the great example of leveraging mathematical understanding. It and the abacus should be the only tools allowed on school tests, high-school through grad-school.

@NicCageForPresident2024 Год назад

I have a box full of vintage paperwork and slide rules as well as all kinds of other graphing and measuring instruments from the early 50s from of my grandfather was in engineering school

@mr88cet Год назад

The embarrassing part is how much of this I actually remember! Old geezer… To be fair though, I hardly ever used a slide tune for actual useful calculations. Scientific calculators had just become commodity products about 2-3-ish years before that. A lot of the perceived familiarity is also just because I intuitively understand logarithms and logarithmic scales, so it’s more that it’s intuitively obvious, than the I actually remember it. However, there were some tricks here I was not so familiar with, like which side of the A/B scale to use. So cool!

@herbiesnerd Год назад

I don’t know how to use a slide rule, but I have zero doubt of its power as a calculating tool. They designed the fastest aircraft in the world, the SR-71 Blackbird before computers. I saw an interview once of an engineer who was one of the designers. He said it was all engineered using nothing but slide rules.