Genius

cool, but that's not a faraday cage

​@@LiviuGeleawhat is it then?

Smart

@@LiviuGeleanever said or implied that it was, only that the invention was inspired by faraday.

I miss the "real" Canal Street. 😥

Nice fix. Lucky you knew or someone knew what was causing it

@@procactus9109 Thanks! The diagnosis and solution were all me. I had graduated with a BS in physics a couple of years before I took the job. While I was an undergrad I worked in a physics lab about 15 hours per week so I was very familiar with RF interference and shielding. Of course I had learned about Faraday cages in my E&M class. I knew about copper tape with conductive adhesive from the physics lab. I felt lucky to have found some down on Canal Street. The best part, by far, was I stayed the entire night alone on top of the Empire State Building "to watch over the equipment". I got to see the sun rise over Manhattan. There is a beautiful view in every direction but you normally can't see it all at once because the place is filled with tourists. It was one of the most memorable experiences of my life.

@@BitJam yeah sweet.. did you leave the copper clad on the boxes after ?, I'd be tempted to keep the copper look.

@@procactus9109 No. We needed to open them up to service them and clean the optics. In most situations there was no need for the copper because the aluminum cases usually provided ample shielding as Kathy demonstrated. It was confusing that the aluminum cases did not provide enough shielding. This is why I was called in. I figured we were getting bombarded by tv and radio broadcasts from close range so I decided to try copper because it's a better conductor. If the copper didn't work then the show would probably have been canceled. There is also stuff called "mu metal" for shielding magnetic fields but that is more expensive and harder to find. The copper looked spectacular! It felt like they were tributes to a Sun god. The aluminum was anodized or painted black which helped camouflage the equipment in normal situations, like nightclubs. We also did exhibits at the (little known) 1982 Knoxville World's Fair. I wrote a byte-code language to program the shows that ended up being the inspiration for Shockwave and Flash. I flew down with a technician the night before opening day. We got up early and climbed over a fence to get inside the fair grounds and started putting our equipment together. We were still fixing things while the first audience filled up the auditorium. A leg had broken off an IC and my tech soldered on the lead from a resistor to replace it. He plugged in the IC when the audience was already in place. We hit the "start" button and by some miracle the show started!

While FM, with it's 100 times shorter wavelength passes through.

It

I studied medicine in the 70’s. Now does a set of 3 Tesla coils mounted within less than a foot of each other in X, Y, Z configuration make any sense o anyone? My simple minded conclusion is at best the whole thing would arc & “self fry” . Just in case this didn’t occur, the fields would cancel each other and nothing would happen no matter how strong the field was. Can anyone with a physics background explain this configuration?

Thanks for having the decency to acknowledge this lady's skills

Thanks for acknowledging this lady's skills

I don't understand. The 6 meter band has a wavelength of nearly 20'. That's greater than the 16' beam spacing. Wouldn't they be blocked?

@@tedstriker5991 Maybe the diagonal distance crossing the steel rectangle made by the horizontal and vertical beams (think diagonal monitor/screen measurement).

I was an Extra class, did mostly 15 meter, some 2 meters & successfully experimented with phased helical arrays in 1.2 GHz with moonbounce with 250 Watts!

@@bakedbeings it doesn’t have a full wave, it can be half wave or 1/4 wave…. Don’t understand how the rebar was set…

it didn't "get out", instead, it turned the building into an antenna via inductance. The magnetic field created by the radio inducted current into the iron beams, which then released the current back out as radiation, or a radio wave. it's similar to how you can place a piece of iron next to a radio, and if it is the correct length, the radio will pick up the signal better. At least, this is my understanding of it. I may be wrong, and if so - please do correct me so that I have a more complete understanding. TIA. :)

I'm glad you found me too. I am constantly surprised how looking into the history has deepened my understanding of the subject. I have a TON of EE videos so feel free to watch more (hint hint)

There's a documentary on YT..."Einstein's Big Idea"...a must see! 👍

Thank you 😊

I was so hoping that you would like it, Jeff. Woo Hoo

Way Cool! I do have a question though. I mean, if I may? I've seen tesla coils with a faraday cage, and they use the tesla coil(s) to make sound akin to what is seen in the movie The Sorcerer's Apprentice. I'm curious as to how the sound frequency would be ran through the tesla coil, so that the lightning vibrates the are to make the sounds?

@@michieal221 Sure… The Tesla coil is a pulsed device in which the pulses are produced by the mechanical spark gap or in electronic coils by a “H” bridge of semiconductors. In either fashion, the energy stored in the primary capacitor of the Tesla coil is dumped into the primary coil thereby creating a radio frequency resonance that microseconds later ends up as lightning from the top of the secondary coil. This dumping of the capacitor can be at any frequency, usually frequencies in range of human hearing. A mechanical synchronous rotary spark gap makes a fixed frequency sound: BBBBRRRAAAPPPPPPP! Electronic coils, however, can vary the frequency of the capacitor dump so much so that tones or “music” can be heard from the resulting arcs.

@@jeffparisse4202 oh. That's really cool! thank you!!!!

Almost certainly to keep them in.

It is not beyond the realm of possibility that the correct answer was: both

A similar room was built in McKee Hall at the University of Northern Colorado, but for testing psychic phenomena. Interesting cross discipline uses, eh, what (Watt?)?

Bell Labs in Middletown NJ was built in a way that the whole building is a huge Faraday cage. As a courtesy for employees they put in AT&T cell service. No other cell phones from other companies work inside.

When we did some measurements on a micro wave radio link equipment situated near a short wave radio station (Radio Kootwijk) we used a Faraday cave to block these shortwaves. It was made from chicken wire. We also had a fm radio playing inside the Faraday cave. If we closed the door the music dumbfounded, if one opens the door just one centimeter we enjoyed the music again.

Just do what Einstein did. Get your girlfriend to do the complicated math for you and take the credit.

​@@DeezNutz-ce5seI have to admit, all my electronics designs were done by my partner, Casio.

The crazy thing is then when you get into a large faraday cage and close the door even though there’s holes you suddenly can’t feel that danger.

There are versions of Benjamin Franklin‘s work that have been updated to have modern spelling but I prefer the originals partially because I really like those fs where I’m expecting an s.

I'm surprised that was not included in the planning.

@@flagmichael Healthcare? Planning? VPs decided moves on unknown merits.

Glad you liked it

Assuming you didn't have "Airplane Mode" back then, you could simply switch it off? Same result, but you'd also save battery that way. 🙄

@@nHans switching off or "flight mode" conveys a voice message that this number is switched off. However on wrapping with metal foil, the message is that network is out of range. Perfect alibi.

@@nHans : ah, but airplane mode doesn’t disable GPS , which will be used by apps to track your location history.

Just realized something about electron microscopes and why they have to 'f'ix' what they are focusing on. The wavelength of the electrons has to be very short so wat they are looking can be observed. However this means the beam of electrons, is so high energy, the beam destroys what is being observed. They 'fix' with various compounds so they can shoot electrons at it and use computers to visualize what the electrons were reflected off. Of course there are transmitting electron microscopes, but the issues are very different.

Glad you enjoy it! I have become addicted to this technique - I really think it is so useful and inspiring.

@@Kathy_Loves_Physics I agree. Makes for a more enjoyable and memorable experience :) And you do it so well - that helps too

So glad to hear it.

Thanks

A car is not a faraday cage, it is a classic lightning protection structure (aside from the glass). Faraday cages are radio tight. Lightning hardening is the art of giving lightning a best path of our choice. I was the lightning hardening guru for the IT Field Services department of a Fortune 100 electric company before I retired. One caveat: cars made primarily from composites are no protection against lightning - you might as well be sitting on a chair.

Thank you so much, I’m so glad you enjoyed it.

Me too. I’m so so so excited (and a bit nervous) about tackling Maxwell and Heaviside in depth.

Thanks (on both counts)

Thank you. The story of conduction and induction is fascinating, isn’t it?

So many people both historically and currently had a nontraditional path to their learning. Congratulations to you for learning on your own and I am honored to be a part of it.

They were such a great channel. I was a total foghead. Am still bummed about it.

@@Kathy_Loves_Physics , yeah, I started listening to them a couple years after they switched to the rock format and they were my only station until they laid off most of the DJs for a youth invasion many years later. Loved Dave Morey and Ten@10!

Ooh, was that before or around the time that the line between Philips and Magnavox got a little hazy? I know they put both names on many products for a good while.

I saw a video of someone demonstrating how his radio didn’t work in a giant Faraday cage and I decided to copy it in a small scale.

Glad you liked it

Thanks so much. I I hope you remember all of it too 😊

I’m so glad you enjoyed it