REPOSTED WITH VOLUME ADJUSTED Make "music" with a carpenter saw, produce frequency patterns on easy to make Chladni plates, AND make your own violin type bow to use with both activities. Science is better when you make it yourself!
Playing the saw brought back many pleasant memories of my own high school physics teacher back in the early 70s. I agree that having the handle for the tip of the saw is certainly easier on the hand! We used a violin bow but making one's own bow I think (as a music teacher) is the better way to go. Great stuff!
This is the most interesting video I’ve seen in a looooong time. I’m going to build some of those plates and impress the heck out of my grandchildren. Thank you !
I love this! I have a program called The Science of Sound that I bring to schools. I'm definitely including some of Chladni plate demos! Thank you for this great video!
Fabulous. I read a section in an old encyclopaedia from about 1900. It explained how to make a “sound picture.” You had to take a metal saucepan, stretch a skin across the top, sprinkle sand on the top and blow down the handle making different noises and record what patterns were made by the sand. I always wanted to do that, but I thought mum might not like it. I still have the book.
I would guess that I've been at this longer than you have (just finished my 40th year) but I hope that you can use what I've learned and surpass me. Thanks for your comment!
@@YeanyScienceHello, I really could need your help. What material is your plate and thixkness, I used 70cm2 aluminum 3mm thick and I cannot make it swing nicely. I am using a violin bow with rosin but will try to build one according to your design.
one of the few scientists doing useful things by YELLING at the equipment. way to manage your supplies! EDIT: also props for using the original meaning of 'fast' before war kind of changed it to mean quick.
Your method of making a bow is simple and very effective. I wish I had thought of that earlier. I had made one by buying the string from a music store, then using a bar clamp as the bow, but the strings were not uniform and started fraying. I'm going to have to make one for next school year's physics class. Thank you for sharing.
I've been impressed with these, I compared it to a regular bow and found it works just as well but it may need rosin a bit more often. I'm not sure if the dowel needs to be bent quite as much as what I have. Good luck with the build.
A neat demo you can do with the violin rosin is to rub a liberal amount on your fingers and thumb (if a piece chips or off, crush it between your fingers and rub it between your index finger and thumb). Grab a metal rod or pipe (copper works great, but galvanized is ver difficult) in the middle with your unrosinned hand. With the rosinned hand, pinch the pipe firmly between your thumb and fingers and slide your hand down the pipe. It should start singing and repetitive stroking will make it sing louder. The waves produced are longitudinal waves and the ends can be seen vibrating by suspending a small washer from the ceiling, and touching the end of the pipe to the washer...the washer will shoot off quickly from the end of the pipe. Making the pipes sing is also fun to do at the hardware stores...you get a lot of puzzled looks. :)
LOL, I do have one metal bar that works but hadn't thought to try it with others and would I'd like to add a variety to my collection. I will try that at the hardware store before making my selections. Thanks Dwight
been trying to do overtone singing lately, it's crazy how these work lol. some theory i heard about frictives being composed of ~5 + vowel or so overtones lol kind of interesting, like I've been using yaw, way (aioueyiou) to try and exchnge chest resonant cavity note with nasal cavity note through the back of the "hyeangiouweay" throat / intermediate part, it's like the sound goes to my nose / ears then out and back to my chest / diaphram note and my tonsil area / mouth chase the note through to my ear's / jaw + head (and you can tune in to single teeth if you find the right oscilation pattern lol. But this is great visualizer for what's happeneing. I'm excited to try different particulates to try and model the cycles that are happening. My mom has colored sand, I told her about your method and she made some of her uglier (gawdy and blech colored lol) sand a tolerable green haha.
When Mr. Yeany started yelling at the Chladni plates, I almost had to stop and rethink my life. I'm watching a grown man yell different pitches into a metal plate with sand on it all in the name of science. But I still love it! Keep up the great work Mr. Yeany!
Well done and amazing, as always! I was surprised that you could use the slippery nylon line for the bow. I know you applied rosin, but I did not think rosin would have adhered to smooth nylon.
Thanks Slater, the nylon works great, I compared it to a real bow and found it worked just as well, however, I did find that rosin may need to be applied more often.
Honestly, thank you for this video. I was planning on buying a violin or cello bow to use on my guitar but it would destroy it in minutes. I'm glad you uploaded this because now I don't have to buy a real one.
I have just made my own "bow", it is more like a long wand though (Same length as standard bow) not too bad as it goes. I just used a thin wooden rod with electrical tape run tightly lengthways (Don't wrap it around, except at the ends). I am going to buy a proper bow but to be able to have a go with just a saw and stuff you may have lying around is awesome fun :D
Bruce, Hi thank's for your reply. My comment was only to give people a shortcut to have a little play with very little effort. Please try it for yourself (Simple bow made of a thinish rod of wood coated in lengththways stretched electrical tape) and let me know what you think, you may be surprised by the results. Your video did inspire me to invest time into the saw :D I am still working on muscle memory but am improving in leaps and bounds.
I have a Chladni plate and a subwoofer. I've been experimenting, however I'm not getting such clear patterns. With a similar setting, how can I connect the subwoofer?
Rosin helps to make the bow string sticky. it's the stickiness that grab the string on a violin, or in this case the edge of the plate and then let go, grab and let go, grab and let go on and on for a few hundred times per second. This is what is setting up the vibrations in plate or in violin strings
I want to know where to by the thing that vibrates and how to adjust the frequency. I am a physics teacher in India . I want to show this to my students. Thank you
Okay so when you rub the bow across the metal plate the sand rests on the nodes because that's where the sound waves are less frequent? So does that mean we're looking at the actual vibrations of the sound? So we could actually physically look at music with that?
I like to think of it that way but we're not quite seeing the sound itself but it is still a beautiful result to it . What we have is the reaction of the material to sound wave energy and the patterns change as the intensity and pitch change.
Yes iam in a bedsit room with the volume up on my pc while i was doing the washing up - reminded me of the sound effects from the Poltergeist film.! ( - ;
Hi Bruce, we've got two science teachers at our school that are trying to figure out how to make the chladni plates, and we can't seem to make them work! We're using 12"x12" 1/8" thick steel; are you using a different metal? We can't get any patterns to form, and we've tried about everything! Any help would be great, thanks!
My plates are made from ordinary sheet metal, about the same as you describe, so my guess is your bow. Did you make a bow or are you using a violin bow? make sure you use plenty of rosin, or maybe a different type, I have two kinds and the one works better than the other. Try the bow on an actual violin if you can to see that it works. not sure what else I can recommend.
A few of them were cut from the sheet metal of an old refrigerator door. Some hardware stores sell sheet metal in various sizes or check for a local metal fabricator, also auto supply stores sell sheet metal for auto body repair
The sounds and the patterns that form are almost alien in nature. Made me think of an alien race that communicates with chirps with frequencies being phonemes then perhaps their writing would look like the chladni patterns on the plates.
Tidbit I found lecture 6/chapter 6 of John Tyndall's book on "Sound" rather wondrous the sensitivities of flames and streams of water to the most faint sounds. And observations of gas lamps at train stations and theaters or a house sparrow's chirrup from 30 yards away ... lots of fun facts ... or things inspiring to know. It's also readable on Google books as well as Internet Archive. archive.org/details/soundacourseeig01tyndgoog/page/n237/mode/1up
Do you know there is a festival dedicated to playing music on saws? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eON-p4afeTkF.html Come play your saw and learn more about saw playing!
Thanks, I have enjoyed making them, unfortunately, I am doing these on my own with a point shoot camera, no budget, no help and not enough time to learn the skills that would make them better. Hopefully people can get past the amateur look that they have.
