Mr. Wizard demonstrates how a siren works. Subscribe now for more science, nature and technology clips from the 1980's Nickelodeon show, Mr. Wizard's World, every week on #WizardWednesdays. SUBSCRIBE HERE: bit.ly/mrwizard
@Calvin5040 We have had violent cartoons for 80+ years. The problem is the Internet and all of this inter connectivity we have today where one click and your child just saw a porno or ISIS/Al Qaeda sawing off someones head or hands. The Internet is really an evil thing and I knew where it was headed even back in 1996 when people started to get it on dial up. By the time broadband came the writing was on the wall but then to put the icing on the shit cake parents are giving mobile devices to 7+ year olds. You do realize that the children of the founders of Tech are not allowed to have the Mobile Internet until they are 17, right? There is a reason for that.
@StormChaser You know how you can tell you're getting old? It's when you think your generation had all the answers and could do no wrong unlike the "wannabe gangsters" of today. Enjoy your life, old man.
@@pedrorltrooper3964 sirens with the "chopper" disk are considered mechanical sirens. Federal Signal 2001-130 and ASC T-128 come to mind. Sirens with literal loud speakers are considered electrical sirens. Federal Signal Modulator and Whelen Vortex come to mind. Both have their advantages and disadvantages. Hope this helped somewhat 👍
My 8th grade teacher had us watch episodes of Mr Wizard in class, and this was one of the episodes I saw. This is how I learned how simple these things are.
I don’t know that I would’ve wanted to do that. Even for getting the possibility of losing a finger or an eye or worse, I can only imagine how loud that must’ve been.
Alright ,tonight idea we will put siren on a child face and let her know how it sounds "clearly" and how much air flow from it .and ask her to close her hand to "decorated" an industrial electric saw disk .
Emergency warning sirens Control by using two things a chopper and a stator The chopper will make the wind chop up into little pieces in the stator controls the sound and if you add horns to it it will Echo more
LOOK!! RISK MANAGEMENT BEING USED!! instead of all the care being taken by someone else, she is taking care for herself. WOW! Kids aren't idiots, who knew!
Hahahaha what the fuck?! SOOO dangerous!!! Only in the 1980’s eh?! No way in hell a TV show or anybody who had a kid would tell a kid to put their fingers near a spinning chop saw spinning at 3000 RPM 😅😅😅 omg hilarious how nuts this is!
We were smarter then and still are. Sure a blade is dangerous. That one was running backwards also. The girl followed procedure so she would not get hurt.
I take issue with his comparison of nice and "yucky" sounds. The explanation of a siren chopping air into little pieces was completely correct and a perfect explanation in itself of how a siren works. However, the "yucky" part is both irrelevant and incorrect. First of all, a siren's rotor openings are evenly spaced, not irregularly spaced. Secondly, the siren speeding up does not make the sound yuckier or distort the sound waves in any way. It's just the same sound sweeping upwards in frequency. A siren may sound "yucky" due to the way its housing funnels the air, the presence of dual rotors, or other physical factors. However, most single-rotor sirens (especially Sentry's models in my opinion) sound generally pretty clear and un-"yucky."
The explanation does make sense. The holes the air is being pushed through are constantly changing size due to the rotation of the fan. Compared to the nice sounds where the holes are of constant size
@@dforbesjr99 No, the changing size of the holes doesn't have any relevance to the "yuckiness" he was previously referring to, and he was wrong to imply that it did. The same hole size change was occurring with the "nice" sounding holes. The "yuckiness" he was referring to is an uneven placement of the holes, causing the pulses of air to be irregularly timed. The demonstration with the saw makes some sense as the sound frequency is actually being modulated irregularly because the holes are spaced unevenly around the disk, but when he demonstrates with the real siren, it disproves his point, because the holes in it are evenly spaced. The real siren he uses is actually the same thing as the "nice" sound on the saw. The only thing happening with the siren is the pitch increasing, there isn't any of the "yucky" as he described it earlier. "The faster it spins the yuckier it gets" doesn't make sense because, again, the only thing changing is the pitch, while the frequency, though increasing, is still even and regular.
That's exactly how an air raid siren, and all electromechanical sirens work, well, minus the whole part where he explains that the sound is because the hole gets bigger and smaller.
