Today we are discussing a 1940's era defense technology that is most akin to a shield generator for a battleship To donate to the USS Missouri: ussmissouri.org/donate-online To see errata for this video: github.com/battleship-systems...
I was an Engineer on British cargo ships in the 1970 s and all the Ships I sailed on had de-gauzing The government paid the shipping companies for it to be installed when built , It had latitude and Polarity adjustments for either hemisphere , We used to go over a de-gauzing range in the Thames in London and they used to Check our magnetic signiture , On one trip we had to Cross a declared uncleared Mine field from WW2 in the Adriatic sea Off DURESSE in Albania and I was Called upon to Make the adjustments and switch on the de-gauzing , Needless to say we didnt set off any mines , BUT in the 1970s there were still areas of the world where mines hadnt been cleared .
@@bernienicholson9582We used to degauss data tape record heads and also bulk erase data tapes and disks using commercial degaussers for secure re-use and media disposal. It’s still named after Carl Friedrich _*Gauss*_. I have no idea where the ‘degauzing’ spelling came from…?
If I recall correctly, there are 3 things that will disrupt a magnetic field. You can heat it, you can mechanically shock it or you can introduce a strong magnetic field. Since you cannot heat a ship, you can't go around whacking it with hammers, that leaves a coil to degauss.
To counteract cheap mines, Navies had to spend a lot of time, money and resources on protective systems. Thus, a win for the mine-laying countries even if they never actually sank a ship.
Very big brain. No fallacious logic at play. Truly the continental powers like Germany scored a big win over the naval powers like Britain and America by laying sea mines. Naval power became irrelevant and a net cost, not a net profit, to countries with navies.
Huh... I was on a Gearing class destroyer that had de-gaussing coils on it. I was a Machinist Mate, so while I was aware of it's existence and purpose, never really paid attention. Thanks for the information!
When I was in high school, I took an elective class of NJROTC. I learned all about the magnetic signatures of any metal object, no matter WHAT the metal. The signature was used to track vessels if the sensor was not attached to a magnetic mine. Go forward a decade, and I started seeing induction loops out in the middle of nowhere on random roads. What could they be for besides counting cars? The Navy had it first, but I realized that a given vehicle could be tracked by just its magnetic signature. Even sister vehicles on an assembly line would have different signatures. This kinda fell off a bit, as cameras are now EVERYWHERE.
The smaller the vehicle is, the less distinct the signatures can be. It'd be nearly impossible to discern between two motorcycles of the same model and year, and pretty hard to tell similar cars apart. But, there's a lot of other ways to track vehicles more accurately than induction, like satellites, ground cameras, passenger cell phones, etc.
@@chrisbalfour466 at the time, that is all they had. Now, we are finding GPS trackers in cars that never had GPS capabilities, installed later. Having trouble clearing codes from your car’s computer? Check for a GPS sender that will likely be piggybacked into the OBD2 harness. Also, if a car new battery loses its charge in just a couple days, look for a….. People are finding them in cars that don’t have all the fancy stuff. Take it off, and throw it on a shelf. You might get a call from the dealership telling you they want it back!
I just discovered this channel thanks to the algo, and I must say....I LOVE this level of nitty gritty! I've been following the Battleship New Jersey channel for quite some time, so I guess it makes sense they would recommend your content to me as well. I'd love to see your channel succeed, and you got a new subscriber today!
As far as sleeping foes, I was infantry, and at one point I was fully asleep, blissfully I will add, as a battery of 155mm howitzers were conduction fire missions less than 100m from my location. Needless to say, infantry can sleep anywhere, and generally on anything in any position.
Waaayyy back in EM-A school in Great Lakes, they taught us about this. Had long forgotten the names of each coil, but then I never had to actually work on them, never used in submarines. ;)
Didn't realize they did this that far back then but it makes sense. My father is a retired electrical engineer and though I chose to study history I do know a fair bit in that area. Would think magnetic mines would detect and attract to most metals as they got close enough to out pull the earth locally. The tech would likely be computer controlled today and somewhat self adjusting as the ship turns the fields would need to readjust. The same system if not adjusted correctly I could see making the signature worse too. Might make it worth adjusting haul construction too today with modern composites and alternate alloys with copper or aluminum that requires induced magnetism with an interacting EM field to magnetize, and then normally far weaker. Could also see a drone ship (or craft) purposely magnetized to travel with larger ships to act as a potentially sacrificial mine sweeper (perhaps with cutting cables between two or more) They would be about the cost of a cheep car to build but could clear a fair sized channel ahead of a ship or convoy.
Thanks for that! I'm Swedish and have heard "Fohk-sul" many times and I wondered what kind of word that was. I had to Google it while thinking about it and apparently it's a Celtic word. Also, I was under the (wrong) impression that it was the Forepeak (Which is called "Förpik" in Swedish BTW). I guess everyday is school day. Thanks for bringing it up.
We have a degaussing station called yanks jetty on orpheus island in Australia. One day when pulling the anchor up in about 18m of water, we pulled up a roughly 1.5” thick rubber cased copper wire and I assume it was leftover from ww2.
Excellent video. I was aware of the practice of degaussing ships & the correcting coils about the binacle, but had no idea that ships possessed their own integral, constant use degaussing systems. Re: sleeping in noisy environments, when bothered by barking dogs or other disturbing sounds, I will turn on a loud fan. Puts me right to sleep.
The slap of the props use to do it for me. The mess deck was above them. And being a marine propulsion operate use to wake-up very quick at the change of the props tune.
This is cool. May I make a suggestion. I suspect most folks think that the guns on a warship were aimed and fired by the gun crews. Perhaps you could do deep dives on the main gun directors, the 5" directors, and 40mm directors. Perhaps in 3ea 15min dissertations? Including CIC and director interconnections.
Very interesting video. I assume the ship must have had some residual magnetic moment after it was degaussed with external coils, and that they ship's own coils were intended to compensate for that moment and make the ship's field the same as the ambient one. Is that correct? The M, F, and Q coils are all horizontal, so I think that they could generate a mostly vertical field with limited horizontal component. If that's right, how did the Iowas do with the A coil? Also, as the ship maneuvered, its orientation with respect to the Earth's field changed. Did they change the coil currents every time the ship changed course?
GREAT VIDEO!!! Do you have any information on the countermeasures that were built for those acoustic sound-triggered mines that were detonated by engine noise. IIRC, I think they towed a giant SPEAKER-LIKE device under the water. I would love to get some information on the power and output frequencies of these devices!! --dALE
Interesting... Thanks, that was helpful. I'm wondering there there's any info for other classes of ship. I work on the USS Hornet CV-12), and I understand it to have a built in degassing system which I would guess is similar to this. I'd be curious to see how the Essex class carriers did it.
Like @bernienicholson9582, I also was an engineer on a UK registered LPG tanker built on the Tyne in 1970 that had a de-guazing system. By the time I joined it in 1979 many lengths of accessible cable had been cut out. Great source of income on the scrap metal market!!!
cant validate this is true, but i saw a documentary showing that Tesla himself was involved in the USA ship degaussing program. and then further developed that into the time travel 'Project Philadelphia' project.
I've heard that modern ships of war will degauss periodically (especially while at port) to help with the more sensitive electronics is there any trith to this?
I’m surprised they used DC instead of AC to degauss. In domestic applications such as television repair at that time all television degaussing coils ran controlled AC through themselves.
After alarge outgassing of polar water from a volcano typically with plumes to 20thousand feet, the upper tropopause should be blanketedat least withing the region with magnetically neutral polarity. Do you have any ideaod what processes or know of what theories cover the ionisation of these regions?
They would need to be an alloy or composite, aluminum is brittle (poor armor properties) and corrodes rapidly with salt water. The Battleship USS New Jersey just traded in magnesium anodes for aluminum ones in her drydocking because they keep her in a river now with little salt. The anodes use a low electrical current to ware away instead of the steel haul. The old ones were in good shape and were for sale by the museum to help raise funds for restoration work. The magnesium works better at sea. They would produce a low level EM field as well.
@@TheJagjr4450 And they already are being phased out because they have too many issues and considered a failed design. Also they are not pure Aluminum and even Aircraft rarely use Aluminum not in alloy form because it is brittle and will not naturally bond to itself. It is one of the few metals that will break apart in a vacuum into dust. Also why airframes have a set lifespan limit based on age requiring replacement even if mothballed, other factors reduce that age. Even soda and beer cans have a plastic liner that can be revealed by dissolving away the Al and can be done with lye and water or a number of other salts, acids or alkaline compounds. Most Aluminum used in any vehicle exterior will be coated as well to resist any contact with water or salt. Also Aluminum is one of the worst metals for a radar signature. Your microwave uses 2 Al boxes to keep the waves reflected inside (First called Radar Ovens as they are as side product of radar technology discovered by a radar tech melting his candy bar from a Radar generator)
@@charlesmaurer6214 We watched the littoral ships in the Mobile AL shipyard bck in summer 2022. FWIW MY dad and his older brother were on a minesweeper (experimental) MSS-1 from 1967-1971. They were the only Navy ship which ran on AC power. It was filled with closed cell foam and the hull was flooded, it ran on Five GMC 12 71's with pinion drives and ducted props. They could hold themselves stable in currents and then detonate mines, 500ft converted Liberty ship - Harry L Glucksman.
You know Elon has a radiation problem, as do all space voyagers. Why can't we use a degaussing system to make our own field to get through the threat zones?
It would help cut down on free protons. But the magnetic field would have to be pretty big to stop high energy particles. You're basically running the LHC in reverse at that point. 😮 That and it doesn't work at all on neutron flux. Or gamma rays.
There are multiple NASAInnovation videos about magnetic radiation shielding, and Curious Droid also has a video about other types of passive radiation shielding.
