How Heinrich Hertz Discovered Radio to Validate Maxwell's Equations
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- Опубликовано: 25 мар 2018
- How did Hertz discover radio waves & what does that have to do with Maxwell's equations? Watch this video and find out!
Thanks to Kim Nalley for the lovely music 
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Correction: At the end of the video I mention that Tesla went to Paris for the World's Fair 5 years after Hertz died. He actually went 5 years *before* Hertz died. Sorry, I blame my small children for all of my mistakes :)
There is much jealousy among very intelligent, competitive, proud, vain people. A lot of jealousy. It is very suspicious that Hertz died in this manner - it is not without possibility that he was poisoned. It seems very odd that he became ill **after** his discovery was published and taking the Director of Physics job at the young age of 32.
Kathy: what Dr. Felton does for history you do for Physics. I am facinated by these things since very early childhood. I now work in the field of power generation and control including marine and industrial diesel and control and power managemen I also design ang build custom equipment for this market, including alternative energy. . I am lucky I didn't electrocute myself or burn down the house when I was a kid! You present these videos in a magnificent way , dense packing information in minutes that took much time and effort to learn. You are planting the Seed Corn of a crop of future Engineers and Physicists here. I most certainly wish these vids were available in 1964 when I was eight. I would have gobbled them up as eagerly as I do now! But I made do with old US Navy manuals that are almost as good as your vids. They also presented the history and theory behind the development of the technology we use. They are Very Well Written and Illustrated. I was lucky to find and get a hold of them! Your Brilliant Vids Are Even Better! I Really wisk I had access to these when I was a kid!!! WOW!
@@Greg_Chase Are there any suspects? Could he have ‘zapped’ himself? How many electrochemical/physics researchers were injured because of lack of safety precautions?
@@fare2muddlin Considering his young age at which he attained a fairly prestigious career position - and had made the breakthrough at proving Maxwell's "electromagnetic waves must exist" idea - and also considering the intellectual toil and dead-ends suffered by most scientists - I feel safe in speculating that his early demise may not have been natural. The timing of it is the noteworthy part. After he developed the first wireless transmitter experiment that could be duplicated and shown to be correct by others. After attaining a fairly prestigious career position. But no way to know for sure.
Having tea several times a week with a jealous colleague once he was settled in his new position. Was their opportunity to get at him? Probably. But we just don't know.
I blame my mistakes on my small child mentality, wait.... What?
Up until now, I thought that Hertz was weirdly inept or lazy. He discovered radio waves and didn't think of the radio, he discovered the photoelectric effect and didn't follow up like Lenard did. Why? Oh, he died tragically young.
Thanks Kathy, I would not have looked up his life and learned more about him if it hadn't been for you. I now have much more respect for Hertz.
If only the History Channel were the way they used to be instead of making programs about extraterrestrial aliens, they would do what you are doing. Keep up the good work.
I am so glad I could introduce you to how amazing Hertz was, I am still sad about his early death. And I agree about the History Channel, used to be so good. Sigh.
You are a wealth of information. It's a pleasure watching you explain things. Thank you!
Mark
So glad you liked it Mark.
Thanks for all these history episodes about electricity, they are so interesting and entertaining! M.S.E.E Widmark
Jerker Widmark so glad you liked it.
The analogy to a vinyl record helped me understand radio waves. I definitely was confusing them with sound waves. Thank you!
Kathy, I have officially fallen into the rabbit hole of your videos. Thank you for making these.
Hertz: "Reallized that most of what I've found so far is already known."
Ahh that's the story of my life!
Weekend Scientist mine too
Yeah, that's a very frustrating feeling.
Even though it's not the focus of the video, I think Kathy's explanation of how a vinyl record works is VERY good. Very simple and concise while being completely accurate.
Thank you. It’s a simple device that no one bothers to explain which I find frustrating as most people don’t know how it works.
Although I teach electromagnetics and I have been involved with this field for 30 years, your explanation is attractive and must be very useful to learners. I always like to listen to others explaining this immortal topic!
Reminds me of the time when I was a young boy growing up in Woonsocket RI, when on a dare, I stuck my tongue in an electrical socket.... OUTCH! Like Hertz I was suddenly inspired....
The way you explain physics is fantastic. I can (and do) watch your videos all day long.
It's really interesting to see how this story extends between figures you normally don't even think about together (from Heinrich to Tesla). I'm enjoying these videos.
I'm glad you like the videos. I am constantly surprised with the links that I have found! I am thinking I should have called it "Links in the History of Electricity" or "Electric Connections" or something. When I am done with the videos I will try to publish a book with all of the material and maybe I will rename it. (ps. Did you watch the Faraday and Maxwell videos?)
@yesca jasta I did
“Connections” immediately brings to mind James Burke’s multiple series of the same name from the 1980s. And along very similar lines ...
Struggling to keep up with the wave of videos haha. You're very wise and wonderful.
I got a charge (pun intended..) when you explained that radio was NOT music. Most people have a very narrow idea of what radio is: broadcast AM or FM. I had someone "brag" that he didn't listen to the radio anymore. All the while he was playing Spotify over a Bluetooth speaker. I didn't bother to explain to him that a Bluetooth speaker was very much a type of radio receiver, so he WAS in fact "listening to the radio"! LOL.
What a great depiction, thank you. You truly are a guiding light in this world of darkness
Beautiful! I'm an Amateur Radio operator and am so glad that they renamed the unit of frequency measurement after Mr. Hertz...so instead of megacycles, we use megahertz! A lot of the old hams still say MC's instead of MHz!
@Topeng Kertas :-)
Kathy -
An excellent detailed report.
Thanks!
Glad you liked it!
The hits just keep on coming!
I love your channel! Learning about the OG's in electricity is sooo fascinating.Hertz's "Electromagnetic waves were of no use whatsoever" must be the mother of all understatement.
Very informative! Many thanks! I don't know exactly what's more beautiful: the science or the history of science!
I was glued to your presentation all along, and thanks.
This channel was one among I was searching For..
I really loved the content chosen..
The way of presentaion..
Combining History and Physics..
And Thank you 😍😍
These kinds of inventors have been my heroes since my childhood.
Very interesting , thanks so much for your work.
Wow ! I am impressed ! Very interesting ! Very well and attractive explanations ! I like every episode ! Now I am a new subscriber ! Continue making these hystorical explained episodes
(I salute you from Romania -east Europe)
Thank you 😍
Radio waves were discovered in 1879 (9 years before Hertz) by the Welsh-US inventor David Edward Hughes. It was demonstrated to the Royal Society in London in 1880.
True, but he was convinced that he was just seeing induction.
Thanks Kathy! I've learned a lot from you and I love your enthusiasm and the way you present the information.
Thank you for making this video. I have been looking all over the internet for info on electromagnetic waves.
This is the best telling of history EVER
I will not download these awesome videos but will keep seeing again and again.
Did not know about Hertz's standing wave experiment. Thank you for the enlightenment!
All your videos are pure gold , I love them .
I cant stop! I’ve got to see the next one!
Thank you for putting these videos in plain terms. Growing up we rarely had practical explanations in school to stimulate our interest.
Your videos remind me of another series called, The Secret Life of Machines. A couple of English guys explain the history of home and office technology.
Thank you for all your time and effort that you've invested for the benefit of the public.
That show was fabulous! I especially love one they had on radio. Thank you for the compliment.
Wow. I absolutely love your story telling. I have always loved this part of history!
your work here is just amazing!
This is a truly fantastic video - thank you!
Its really feeling awesome to watch your videos, great work done by you for mankind. Thanks a lot.
Goodness, I love your show! Thank you!
Thanks for the stories behind the physics. Especially for this episode, as I sometimes refer to Hertz as my "neighbor", as I lived in the house right next to his home in Bonn for five years.
Great video. Just came across your channel and am enjoying it. To quote Helmholtz: 'Bravo!'
Thank you (blushing)
Another great walk through the history of science
Great video. Thanks the history.
Best line: "He was showing his equipment to his new fiancee".
Good work Kathy, Physics=FUN!
thank you so much for this kathy! this helped me understand this topic even more! blessings & peace to you
Thanks, I’m glad it helped. Cheers, Kathy
Fantastic!! You are Great!
Great way to learn science! Thank you!
Fernando you are very welcome.
I always wanted to know the history of scientific development , and being a science student ,this is one of the best place i got this,this will help me a lot for development of my scientific understanding, thank you for such an amazing explanation
thank you for another fantastic video Vielen Dank from Germany
Very good class!
I enjoyed this video. Thanks for posting. I am now a subscriber.
Fascinating
very interesting. thank you
Wonderful
Thanks
Go on
This is so interesting! :) thank you Kathy! I just found your channel
Wonderfull!!
I'm impressed.
I'm a fellow-citizen of Guglielmo Marconi, fanatic admirer of him.
I'ts very impressive to hear here that if Hertz had lived more years, he probabily would have invented radio-telegrapy!
Impressive indeed!
Great video
I wish we could hear your lectures live
Thank you 🙂
William Thompson was elevated to the peerage as "Lord Kelvin".
Ha-ha-ha - I love it!
(1:59) I just BET he did! Only glad that it caused a spark rather than his fiancée yelling for a Gendarme.
lol
Superb explanation mam....
so glad you liked it sir
Very good 🙏🙏🙏🙏🙏🙏
great video
I like this lady..... pleasant, enthusiastic, authentic, wholesome... fresh out of the shower!!!
Cool!
Hertz, had he not gotten sick, might have RE-invented wireless telegraphy, but could not have been THE inventor, since Mahlon Loomis had already demonstrated it decades earlier, without ANY knowledge of Hertzian waves. It turns out not to require an AC (let alone r.f.) source feeding the spark gap, because DC power (as supplied by kite and ground, Franklin style) creates r.f. transients when a long wire is switched into and out of contact with such a source.
Sincere thanks for the history and understanding physics.. (inventor)
"If I have seen further, it is by standing upon the shoulders of giants" Sir Isaac Newton, February 1765. Thanks Kathy.
Thank you so much for your fascinating videos.
Perhaps I have missed it, but you don't seem to have mentioned Bardeen, Shockley and Brattain who won the 1956 Physics Nobel Prize for what I consider the greatest invention of the 20th century - the transistor.
yes kathy!! i feel you 😅
Superb! I'm a mere biochemist, though had to wade through spectroscopy. Sometimes I wonder how I made it!
Thanks for your wit and acumen!
Really interesting and clear information. Sad that Herz died so young, life's like, we must enjoy consciousness and live the best we can every day. Will share this with my classmates here in Mexico. I think there´s still a lot to discover in science that can make this a better world. Hope you´re really fine.
I just discovered your channel and I love it. I've been involved with radio since I was five and that was 65 years ago. I eventually became an electrical engineer but am still fascinated by the early pioneers of radio. You videos are well researched, accurate, and interesting. One point to note is that Hertz would have not discovered radio waves had not the battery been first invented. And the battery also depended on previous discoveries and inventions. I think it would be interesting to trace back as far as possible how previous inventions provided the impetus for subsequent major discoveries. If you have already done this, my apologies. I'm new to you channel and have not yet seen all the videos, but I'm working on it.
I think you will be pleasantly surprised when you look at my other videos.
William Thomson's name is misspelled......I love the vid especially the way the Maxwell Equations are cunningly navigated
Thank you for pointing that out, I always want to add a "p" to Thomson's name, don't know why. I have to figure out how to add a little card over the video without redoing the whole video.
Glad you liked the video aside from my spelling.
Brilliant! thanks for these amazing historical facts. I have read that not all of Hertz's conclusions were correct, some of his conclusions were wrong because he didn't take into account the room's dimensions. Unfortunately, I didn't manage to find more details. Could you please make some research about it?
Can you do a video about Heaviside please??? he is a forgotten genius that make a lot of contributions to modern EM theory.
About Hertz it just shows that falling in love broaden ones mind :-)
I love that
The electromagnetic waves is what to tell us about rest and motion - both relative and absolute rest/motion go away in Hertz experiment.
Love ya
6:18 in order to create standing waves. He first had to move the mirror until he was getting a stable measurement. Only then, could he move and see that the amplitude is rising and falling per motion.
Greetings! 5:51 Parallel or perpendicular? (great video)
With Maxwell love Hertz.
What is a vinyl record? What kind of contraption is that shown at 3:08? Is that similar to those ancient "Compact Discs"?
Sometimes a person buys a house that was previously a meth lab. Often the house has to be torn down. If you're going to buy a house you could talk to the neighbours first.
Maxwell, though known as a theoretician, as performed some amazing experiments. Had Maxwell lived longer, and not die in his 50s, he may have had the 1st experiments demonstrating radio.
As for Hertz, it was still "cycles per second" until the 1960s, when the "hertz" was adopted.
I think that if Maxwell had lived longer he would have discovered Special Relativity.
How much of a Radio wave is a Photon?
excelent video, congratulations, I hava a question, excuse me, why did he use two metal spheres to the end? what was the function of thes spheres and why now some people don´t use that spheres and use plates? please ty
It didn't do anything, he just tried whatever hoping that something would work.
NiceJob!
What's the frequency Kenneth?
Might be interesting to cover Jagadis Chandra Bose’s experiments with microwaves in 1895.
👏👏👏🙏🏼
He was showing his equipment....
Alrighty then.
The record you showed was not made of vinyl. It was an old 78 which were made of shellac
If you can make the vacuum to vibrate, you get the electromagnetic wave.
What exactly did Heaviside leave behind in compressing Maxwell's equations? And how is it not relevant?? Anybody know?
your videos are fantastic but some of the words really hard to catch, it could be helpful if subtitle enabled
I am working on it. My last 15 videos have captions and every new video I pay to caption 2-3 old ones. Hopefully, I will get to this one soon, sorry
You can personally turn on auto captioning, which I do, being somewhat hearing impaired.
What form do the magnetic and electric fields take with dc current? Thank you for your help!
With a DC current there is no electric field, not even an induced one. You have to stop the charges with an excess in one place or another to produce a fixed field, or oscillate them (or otherwise accelerate, i.e. change, their motion) to induce fields. However, a DC current *does* produce a fixed magnetic field, as has been illustrated in earlier entries of this video series.
@@goodmaro if thats the case why does my clamp around dc ampmeter measure current without touching the wire?
@@dougdoug2165 Let me get this straight...you have an ammeter that has a probe you clamp "around" a wire, and the other ammeter lead is what, grounded?
@@goodmaro no it looks like a lobster claw just like an ac clamp around meter. You simply open the claw and it has interlocking metal laminations inside that connect when closed. No other connection made it reads the amount of dc current flowing in amps.
@@dougdoug2165 Wikipedia under "current clamp" describes a few types of ammeter like that. There is no electric field around the DC conductor, but the clamp is able to measure the *magnetic* field from the DC, and from that the current can be calculated.