How Does A Siren Work? (Mr. Wizard)

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

[@david-barna]

"Here, let me pull your hand toward this serrated disk of death." - I love the 80s

[@johnwagner4776]

Nice spinning circular saw blade for a kid to put their hand next to

[@blaircox1589]

I watched this show every morning before school. Truly natural selection at its best 😁

[@ShotgunGrammy]

Same

[@bobcratchet3736]

😂 Almost as fun as Lawn Darts.

[@Urstupidumbass]

They use a fucking circular saw to demonstrate this shit lol.

[@nextstorming3908]

Yeah let's cut some fingers off

[@MrWolfSnack]

+NeXTSTORMING 1:26 one slip of the hand and her pinky finger would go bye bye

[@PinkFloydrulez]

+James back in the good old days when no one cared about this political correctness shit or minor flesh wounds

[@morgengabe1]

+James Now wouldn't you have paid more attention in school if your physics demos were so crazy?

[@flywalll]

Gud ole safe 80s. :D

[@seanshnizzy]

Siren to the face, hand an inch from circular saw, looking inside an open siren spinning without eye protection. Oml

[@shawnwheat6259]

sean connor cool

[@dropndeuces82]

The 80s summed up

[@TiberiusStorm]

And no ear protection!

[@marcterry9426]

Mr. Wizard! Gotta love the 80s.

[@chema8360]

Easy, Karen

[@caillousdad5786]

that's why the 80s and below were awesome, dangerous shit could be gotten away with lol

[@marshallbrooksmusic]

for years I've wondered how these things work and never got around to looking into it. glad I did, this is neat stuff

[@fjccommish]

How was that dangerous unless you were an idiot who touched it?

[@alicar1]

It breaks the air into little chunks, and your fingers into little chunks.

[@walrusdojo]

The last ten seconds are pure gold when taken out of context.

[@childishtombino1275]

"The faster you go, the more yuckier it gets" lol

[@zackplyler4484]

This is a great informative clip, im an adult who had no clue. I thought it was some sort of speaker or something

[@pedrorltrooper3964]

A few of them do if i am not wrong, but mostly not

[@onefastslimjim]

@@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 👍

[@pedrorltrooper3964]

@Slim Jordan holy... now that is a lot of information! Thanks tho

[@abdullaharif6455]

​@@onefastslimjim*Electronic

[@abdullaharif6455]

There are also speaker sirens, but this is about the more mechanical type of siren.

[@tomr200199]

I love the world before health and safety was a thing!

[@calito44]

I think he is referring to the fact that the girl was allowed to put her hand near a sharp cogwheel

[@Calvin5040]

@StormChaser Yeah because kids didn't have violent cartoons back then.

[@thebeststooge]

@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.

[@thatonethattalksalot7656]

I truly agree with you!!

[@blueszooz9031]

@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.

[@JMAircraft]

"Yucky sound". Bruh, I don't know what you're hearing but I hear sweet fire truck music.

[@JonnyDIY]

3:02 "Don't back away, it won't bite you" 🤣👍🏻

[@jmWolfe2585]

Jonny DIY but the priest will

[@stephensnell1379]

The young girl didn't like the noise due to the horrid sound the siren was making

[@SylvesterTheSupernatural]

Siren Head: let's see about "it won't bite you" 😈

[@leandro4552]

Safety it's too mainstream.

[@KingCreeper562]

I just spent 10 minutes searching for how these things worked, this is not what I expected to find but it finally answered my question.

[@gyorgykozmer7714]

"You wanna take one apart?" "No." lol 😂

[@POVTrucking]

he says "have you ever taken one apart ?"

[@Bryan198026]

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.

[@dylaneliot3582]

no thought of losing fingers!

[@shawnwheat6259]

DylanEliot Williams fuck you

[@The_JEB]

you have 10 fingers, you dont need em all.

[@dropndeuces82]

That's Drew Barrymore

[@Polymershik]

Cool, but was it necessary to use SHARP DISC? )

[@jj987987987]

kids are not retarded.

[@scottrogers2971]

Kids are retarded

[@jj987987987]

@@scottrogers2971 kids are what you made them to be. If they dont have any specified mental issuee they only relect their mentor's intelligence.

[@14.quachanhkhoa78]

@@wjjanshsbaan8599 *i am

[@da4127]

Yeah, the risk or getting your fingers chopped off is the essence of the program

[@kagome122885]

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.

[@BananaPhoPhilly]

That girl was very smart for her age, or she was given a script lol

[@shareten1247]

girls cant be that smart has to be a script lol

[@halpmeamcringe1538]

@@shareten1247 r/wooosh

[@shareten1247]

@@halpmeamcringe1538r/woosh

[@halpmeamcringe1538]

Finally! A worthy opponent! Our battle will be legendary!

[@FreeFoxRagu]

@@halpmeamcringe1538 xDDDD

[@cjmarsh504]

I miss this show

[@rippspeck]

Fuck hearing protection! *WHAT?*

[@dropndeuces82]

Drew Barrymore loses fingers to my favorite Scientist. Eat your heart out Bill Nye

[@spaceedementia]

😂😂😂

[@jansenart0]

1:00 Don't mind the saw blade....

[@lmoore3rd]

They didn't have to put a legal safety disclaimer when I watched this as a child in the 80's. I turned out ok. 😆

[@chadrowland5234]

Nowadays, sirens use a pre-recorded noise on a sound card that plays on a loudspeaker.

[@SylvesterTheSupernatural]

That type of siren was such a bad idea 😅

[@EvilForgemaster]

Am I the only one who found the ending very funny?

[@j3ttagrl420]

that's all i needed to know! i miss mr. wizard. 💕

[@TEAMWHIRLWINDINTERCEPT]

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

[@joshuaryanferguson3702]

The 5th holes make it sound like a thunderbolt

[@l-vaeronautics2734]

Miss this show!

[@trentonjenkins5025]

Mom: How did you sleep last night Me knowing I didn’t because I wanted to know how sirens worked at 3 in the morning

[@valleyfirebuff9694]

It’s not a bad sound

[@spaceedementia]

I think you may be a little bias ;)

[@gerardonavarro3400]

I just came here to see how siren head works lol

[@bojangles8976]

No one cares

[@the_real_drwhoroblox1935]

I agree with that dude f off

[@SylvesterTheSupernatural]

He/it uses 2 CORE PA loudspeakers. Of course the sirens are aged due to exposure to the elements

[@Валзрии́пачивзнко]

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 .

[@neilsmith9066]

Mr Wizard was The Best!!!!

[@hokiangateroroa]

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!

[@entityk14]

2:39 Little blades. He called them little fans.

[@Chuzzlepuff]

mmm yes small child, get CLOSE to the sawblade!

[@RideToLyf]

Great explanation!

[@induvenugopal9956]

Now I know how that works....

[@Cemoman17]

Awesome.

[@ComradeDt]

1:04 ahahaah u wot m8

[@danielesposito9705]

Did he invent lawn darts next?

[@maxwellcrazycat9204]

For me it's when I'm speeding on the freeway. Siren works.

[@mariestick6636]

Awesome

[@nic3guy5585]

LMAO girls ears start bleeding

[@jimmymelonseed4068]

So much anxiety

[@TheAllroundniceguy]

THAT IS A SAW!

[@GeraldBlack1]

OMG safety first lol!

[@hikingviking8309]

When I initially clicked play it started the video off at 2:30 in.

[@wheresmyclicker]

Like, why is it a saw blade? Why not at least grind the teeth off? He wasn't even holding her hand steady for her at the end. Easter candy time.

[@PedroGomez-bd9ro]

This wouldn't make sense without the serrated edge on the wheel

[@Manzie1000]

The sound is chopped into pieces just like your hand if it gets too close to the blade sweetie 😝

[@airraidsiren260]

What sound she think is yucky is the best sound for me

[@seebradrun]

At least it was safe

[@Pegasus-dm1oe]

2:30

[@alisadashaflushinghillsbri6329]

Nice👍

[@eddiejones.redvees]

Safety first be careful now

[@Bigstinkyjar]

Why did the blade have to be a saw blade any metal circle would work

[@jurtra9090]

Why this kid sounds smarter than kids nowadays? Perhaps it's a good decision that i never touch TikTok

[@MrWolfSnack]

That's a good way to make someone deaf.

[@Michael-pl4vn]

Is that a fucking saw?!?

[@bananacat3985]

I heard a siren today ;-;

[@SuperRiki81]

I wanted to know what would happen if she put her hand in there at the end...

[@rdfox76]

She would have lost her fingertip.

[@SuperRiki81]

rdfox76 i cant even remember posting this. but it sounds like me....hahah

[@eringobreathtiocfaidharla1446]

Isn't she so beautiful x

[@thatonethattalksalot7656]

Safety and health killed the freedom of doing amazing things although that don't stop anyone from doing what they love right!

[@zzoinks]

So it is pretty much a really loud whistle.

[@GOVT-fy5pi]

It is really a fan that just chops air. The resulting chopped air creates sound waves. The waves are what you hear

[@shadygaming6523]

is this tim?

[@skiddzie9291]

why the fuck did they use a circular saw LMAO

[@djvelocity]

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!

[@WS-gw5ms]

Lol why use a saw blade?

[@ryuga475]

who needs speaker

[@All_Time_Fresh]

More noise, waw!

[@shawnwheat6259]

Ok I'm going to try to get a chance I would like to know if you have any messages from you know that u to be home

[@michealarburn9861]

Yes it was dangerous but can kids these days give such intelligent answers 🤷

[@zeldon3684]

Theres a fkn saliva

[@ithken]

sirens are not yuky some poeple like them its thire hoby

[@Elpoyoloco1]

wuttttt.......the little girls fingers were so close litirely sooo dump thing to put the girl into these.....i mean come on a cicrular saw??

[@whitbyretreat145]

Todays the woke liberal parents wont even let the kids near such loud siren

[@ayoolamehmehmehmehmehmeh5784]

Am I the only person that See's saliva dripping from the girls tube

[@herold4566]

Smort

[@middleclass4137]

इतनी age mai mujhe ghanta smjh nhi aati thi science , upar se teacher भी chomu the

[@FreeSoundLibraryEffects]

Yucky sound. Lol

[@mikgus]

took 3min before a saw who mr wizard was

[@ZacharySalman]

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."

[@dforbesjr99]

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

[@ZacharySalman]

@@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.

[@rotempeer-raviv4859]

Joe Biden teaching science!

[@neilsmith9066]

Mr. Wizard was a bada$$ Joe Biden not so much

[@rodkarch6578]

that is not how an air raid siren works

[@duanecottrell]

Yes it is.

[@childishtombino1275]

It is

[@dylxnchn]

Rod Karch it is you dummy

[@flyoversirens3704]

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.

[@SoonerStateSirens1]

They aren’t speakers

[@audiodood]

Thats actually not how that works

[@tsherman6434]

3:10