I really liked this one, and the follow-on videos show a lot of promise. The maker starts with the four equations that we see on T shirts. He admits that at the time he first saw them, he did not understand. But in this video, he digs in, and finally gets it. The connection between Maxwell's equations and C (the speed of light) are especially well presented.
There is a document that goes quite a bit further, and explores the connections between Maxwell's equations and quantum mechanics. It is by that wonderful physicist Freeman Dyson. It is entitled "Why is Maxwell's theory so hard to understand?" Check it out:
This line from the Hack-A-Day article got me: "Everything on the electromagnetic spectrum has some properties of both waves and particles, but it’s difficult to imagine a radio wave, for example, behaving like a particle."
It is indeed difficult (at least for me!) to imagine this, especially when we think of the operation of that dipole using waves (not particles).
First off, what a great name. It is a real ham radio name. Grote Reber. And he was indeed a ham: W9GFZ. We don't have names like that anymore. But we should.
Second, Grote Reber's mother was also the teacher of Edwin Hubble. Hubble was the guy who discovered that there were OTHER GALAXIES in the universe, and that they were all moving away from each other. That was a BIG discovery! Later, Grote's mom also had her son in her class. Both students were from Wheaton, Illinois.
Lest there be any doubt about Grote's dedication to radio, consider the following. (Much of the following comes from Wikipedia. https://en.wikipedia.org/wiki/Grote_Reber)
When he learned of Karl Jansky's work in 1933,[5][6][7] Grote Reber decided this was the field he wanted to work in, and applied to Bell Labs, where Jansky was working.
In the summer of 1937, Reber decided to build his own radio telescope in his back yard in Wheaton, Illinois. Reber's radio telescope was considerably more advanced than Jansky's, and consisted of a parabolic sheet metal dish 9 meters in diameter, focusing to a radio receiver 8 meters above the dish. The entire assembly was mounted on a tilting stand, allowing it to be pointed in various directions, though not turned. The telescope was completed in September 1937.[8][9]
Here is a really great article from Sky and Telescope magazine (July 1988) about Reber's homebrew radio telescope:
He was limited by the size of locally available 2X4 lumber. Neighbors thought he was trying to control the weather or to bring down enemy aircraft. Between Wheaton and the NRAO site in West Virginia, Reber's telescope spent some time at the National Bureau of Standards site in Sterling, Virginia. I was in Sterling just yesterday. I wonder if there is a plaque or something noting the telesccope's stay in that town. I note that at age 15, Reber had built a ham radio transceiver.
AND THEN HE MOVED TO TASMANIA
He did this because of propagation and low noise conditions. (This reminds me of how we sometimes said that very few people have actually said the words, "And then we moved to the Azores.")
Starting in 1951, he received generous support from the Research Corporation in New York, and moved to Hawaii.[12] In the 1950s, he wanted to return to active studies but much of the field was already filled with very large and expensive instruments. Instead he turned to a field that was being largely ignored, that of medium frequency (hectometre) radio signals in the 0.5–3 MHz range, around the AM broadcast bands. However, signals with frequencies below 30 MHz are reflected by an ionized layer in the Earth's atmosphere called the ionosphere. In 1954, Reber moved to Tasmania,[12] the southernmost state of Australia, where he worked with Bill Ellis at the University of Tasmania.[13] There, on very cold, long, winter nights the ionosphere would, after many hours shielded from the Sun's radiation by the bulk of the Earth, 'quieten' and de-ionize, allowing the longer radio waves into his antenna array. Reber described this as being a "fortuitous situation". Tasmania also offered low levels of man-made radio noise, which permitted reception of the faint signals from outer space.
His Homebrew House in Tasmania
In the 1960s, he had an array of dipoles set up on the sheep grazing property of Dennistoun, about 7.5 km (5 miles) northeast of the town of Bothwell, Tasmania, where he lived in a house of his own design and construction he decided to build after he purchased a job lot of coach bolts at a local auction. He imported 4x8 douglas fir beams directly from a sawmill in Oregon, and then high technology double glazed window panes, also from the US. The bolts held the house together. The window panes formed a north facing passive solar wall, heating mat black painted, dimpled copper sheets, from which the warmed air rose by convection. The interior walls were lined with reflective rippled aluminium foil. The house was so well thermally insulated that the oven in the kitchen was nearly unusable because the heat from it, unable to escape, would raise the temperature of the room to over 50 °C (120 °F). His house was never completely finished. It was meant to have a passive heat storage device, in the form of a thermally insulated pit full of dolerite rocks, underneath, but although his mind was sharp, his body started to fail him in his later years, and he was never able to move the rocks. He was fascinated by mirrors and had at least one in every room.
To Canada -- And a Rejection of the Big Bang
The same July 1988 issue of Sky and Telescope magazine has a good historical vignette of Reber, with a focus on his actvities in Canada late in life (click on the image below). Reber had big doubts about the big bang. Unfortunately this seemed to spill over into scorn and ridicule for those who -- well -- believed in the big bang. We see this at the end of the article. Oh well, even great people sometimes get cranky.
Three cheers for Grote Reber.
I had trouble making the WayBack Machine links to work on my blog. But they seem to work on the Wiki page. So to see them, go to https://en.wikipedia.org/wiki/Grote_Reber Then go to the Reference section and take a look at the second and third items.
On the Importance of Really Understanding Radio and Radio Circuitry
In the first version of my book I included (in bold letters) sections in which I described my efforts to
deeply understand how the circuits I was using really worked. I mentioned that this yearning for
understanding probably had its roots in the influence of Jean Shepherd: Shep seemed to expect true radio
hams to really understand the gear that they worked on. As a child, James Clerk Maxwell would often ask
about how things worked: “What’s the go of it? What’s the particular go of it?” That is the kind of
understanding that I wanted. But as I progressed, I would often come across hams who had other notions
about what constituted “understanding.” These people were often Electrical Engineers, deeply schooled
in mathematics. For them, knowing the math was synonymous with understanding how circuits worked.
Asked, for example, how a mixer mixed, they would spit out trigonometry formulae. I found this kind of
understanding insufficient and unsatisfying.
I was not alone:
In 1990, after seven years of teaching at Harvard, Eric Mazur, now Balkanski professor of physics and
applied physics, was delivering clear, polished lectures and demonstrations and getting high student
evaluations for his introductory Physics 11 course, populated mainly by premed and engineering students
who were successfully solving complicated problems. Then he discovered that his success as a teacher
“was a complete illusion, a house of cards.”
The epiphany came via an article in the American Journal of Physics by Arizona State professor David
Hestenes. He had devised a very simple test, couched in everyday language, to check students’
understanding of one of the most fundamental concepts of physics—force—and had administered it to
8
thousands of undergraduates in the southwestern United States. Astonishingly, the test showed that their
introductory courses had taught them “next to nothing,” says Mazur: “After a semester of physics, they
still held the same misconceptions as they had at the beginning of the term.”
The students had improved at handling equations and formulas, he explains, but when it came to
understanding “what the real meanings of these things are, they basically reverted to Aristotelian
logic—thousands of years back.”
To Mazur’s consternation, the simple test of conceptual understanding showed that his students had not
grasped the basic ideas of his physics course: two-thirds of them were modern Aristotelians. “The
students did well on textbook-style problems,” he explains. “They had a bag of tricks, formulas to apply.
But that was solving problems by rote. They floundered on the simple word problems, which demanded a
real understanding of the concepts behind the formulas.”
This is an interesting project. The use of dental X-ray packs was really innovative. The approporately snarky presentation about nanny-state nervous nellies was great. It all reminded me the X-ray chapter of C.L. Stong's great book "The Amateur Scientist." Here is a .pdf of the book: http://www.ke5fx.com/stong.pdf
The X-Ray machine in Stong's book appears on page 500 (520 in the .pdf) Here is the opening paragraphs:
Indeed, it was lonely up there in the 10^-8 cm band!
But who is behind Project 326? Who is the robot narrator's human assistant? At first I thought they were joking when they said they were in Southern China. But YouTube does show them in Hong Kong. He has British accent, but oddly he calls valves "tubes." He also seems to use quite a bit of SolderSmoke terminology and practice: He uses copper tape as a ground plane. He talks about relaeasing "Magic Smoke" and of passing or failing "the smoke test." Could it be that Project 326 had been listening to the SolderSmoke podcast? We hope so! Please let us know if y ou have any background info on this mad amateur scientist.
Thomas K4SWL has a good post about the importance of taking a break from radio. Following up on this, I noted that "taking a break" is often a good way of finding a solution to a difficult problem. I noted that I have confirmed this -- it has worked for me. Pete Juliano N6QW recently announced that he is taking a break from the MHST project. That is a good idea. A solution will likely emerge.
I noted that there is some evidence backing up our suspicion about the benefits of breaks. I earlier shared some comments from Harry Cliff's excellent book, "How to make an Apple Pie from Scratch."
Harry also wrote about the usefullness of taking breaks. In 1917 Ernest Rutherford was having trouble understanding the presence of some hydrogen nuclei. Harry writes:
"Again, he was forced to put his work on hiatus to go on a mission to the United States in the summer of 1917, but it turned out to be one of those useful breaks when stepping away from a problem lets your mind slowly work out the problem in the background. When Rutherford got back to the lab in September he had the answer..."
I've been a fan of Jeroen's YouTube channel for a while now. He has a very nice approach, combining theoretical knowlege with practical experiments and equipment builds. Here we see him using a photomultiplier tube and a board acquired in flea market to build his photon detector.
This video has a lot to offer us. First, there is a single thermatron. There is a tube socket. There is a (really small!) high-voltage power supply. He uses an oscilloscope. There is a laser. There are photons. And at one point, a single photon.
Having recently built a simple Wilson Cloud Chamber, my attraction to this device is easy to explain. I suspect our friend Grayson will be interested in it for Thermatronic reasons. There is a Part II. Check out the YouTube channel:
Here is more info on the channel and it's creator:
Hi, my name is Jeroen and on the Huygens Optics channel I publish videos on personal projects. My main fields of interest are optics, mechanics and photolithography. The videos aren't targeted towards a general audience but for people with a passion for science and technology (e.g. my fellow nerds).
The channel is named after the famous Dutch mathematician, astronomer and inventor Christiaan Huygens (1629-1695). He was the first to publish a mathematical description of the wave properties of light, and also discovered Saturn's rings.
I continue to mine the AT&T video archive. Here's a really wonderful 1961 film showing how particles really are waves also. The simplicity of the gear that the Bell Labs folks used to demonstrate this is really admirable. I would love to see the preceding film (the one that shows how light waves are really also particles).
As I have mentioned in the podcast and in blog posts, I have a lot of trouble picturing HOW 20 meter photons somehow fly off my antenna. I understand how EM WAVES are generated. But there doesn't seem to be any corresponding explanation for how the photons are generated.
This video looks at a related question: How BIG are the photons of visible light? I am not sure this is all correct (and neither, apparently, is the creator of this video) but it is very interesting.
This is a really wonderful video. I especially liked his presentation on the nature of the EM spectrum, and his use of the centimeter waves to demonstrate wave behaviour. The two slit experiment was very nice. Sir Lawrence's presentation on SWR was brilliant.
Still, you wonder how would all this be done if those waves of Sir Lawrence (and Young, Maxwell and Faraday) were considered to be the photons that they also really are?
Today's aparatus (above). Chamber is larger and I left the bottom sealed. It sits directly atop a chunk of dry ice. The spongeat the top is soaked in alcohol.
This is a one minute clip. It does seem a bit like watching paint dry, but you will see many atomic particles moving through the cloud. If you look to the right side of the screen you will see that the cloud has started to rain alcohol. I will put additional clips on the Patreon site.
Harry Cliff's wonderful book mentions the origins of the cloud chamber.
I think that is all I will do on the cloud chambers. This was a lot of fun, but I am running out of dry ice. There is, however, a lot of room for improvement and experimentation here, and a project likes this puts you in touch with the earliest days of particle physics (as Harry Cliff explains above). Good luck on 1.22 nanometers! Please let us know how you do.
Here is one more look at the "output" of my cloud chamber. This is a ten minute video. You can see many traces in this. Check it out:
It was time to take a break from building SSB transceivers. I wanted to build something completely different. I went with something that I've wanted to build since I was a kid. Sometime in the late 1960s, I read about a Wilson Cloud Chamber in the book "The Amateur Scientist" by C.L. Stong (my mom got the book for me, at great sacrifice).
You have to make a little cloud in a chamber. When an atomic particle flies through (as they do!) it will leave a little trace in the cloud. Cool. Literally cool: This is a dry ice diffusion cloud chamber. You make the cloud by putting isopropyl alcohol in blotter paper at the top of the chamber. You then cool the bottom part (a lot) using dry ice. The alcohol evaporates, then is cooled into a cloud by the low temperature of the dry ice. Fortunately, my local supermarket has started selling dry ice (it was harder to come by when I was a kid). For the chamber, I used a plastic container from the same superpmarket. For the light source I used a little LED workshop flasllight.
I saw traces immediately, while I was setting the thing up.
Here are two videos of what I saw during that first hour:
This one minute video shows the traces I saw. Look for the little whisps of "smoke":
This one shows a few more traces, but then BOOM at about 27 seconds. Check it out. What is that? (Thinking about it some more, I think this may have just been some higher humidity air leaking into the chamber and condensing suddenly.)
Wow, I've been wanting to build a Wilson Cloud Chamber for a long time, ever since I read about one back in the 1970s in C.L. Stong's famous book "The Amateur Scientist." Now this fellow Jim Messier comes along with this amazing video that features a cloud chamber that he built for a few bucks at age 13. I am feeling the pressure. No pun intended.
Back in the day, a reasonable excuse for not building this device was that it was hard to find the dry ice you needed for the cooling. No more! Now, at least in this area, you can get dry ice at your local supermarket (bring thick gloves or else you can burn your hands on this stuff). The heat is on. Well, actually the cold is on.
All of this was sparked by a visit to Jim Messier's amazing YouTube channel, "Our Own Devices." There is a lot of great material there. Check it out and subscribe: https://www.youtube.com/@CanadianMacGyver
I think this is one of the best troubleshooting events in radio history: they thought at one point that what they were hearing was the result of pigeon poop in the antenna. Turns out they were hearing radiation from the birth of the universe.
And here is a wonderful 2014 6 minute podcast with Penzias and his co-discoverer Robert Wilson:
The first one, about ham operators in general, is pretty depressing. Then it goes downhill as they shift to those who are listening to baby monitors and cell phones. Yuck.
The second one seems to show some physicist having understandable difficulty explaining particle-wave duality in a short TV segment.
There is a short bit (that I didn't quite get) about the BBC's "Teddy Bear's Picnic."
The final one is about Gerald Wells and his Antique Wireless Museum in South London. Note the white coat -- clearly a boffin. For a while I confused him with Rupert Goodwins G6HVY (similar white coat, but a different bloke).
Don't let the scary nuclear chemistry title put you off -- there is a LOT of very familiar homebrew stuff in this video. You will feel right at home. Many of the resonances take place in the ham bands. The CBLA may have to get involved here.
Thanks to Chuck WB9KZY for sending this.
And check out Ben's video on is best projects from the last 10 years:
Andreas DL1AJG (who in real life is a professional biologist) sends us this excellent article about how biologists approach problems in living cells as opposed to how engineers or technicians approach problems in broken radios.
This excerpt from the 2002 article gives you an idea of the tone and content of the article:
"... I started to contemplate how biologists would determine why my radio does not work and how they would attempt to repair it. Because a majority of biologists pay little attention to physics, I had to assume that all we would know about the radio is that it is a box that is supposed to play music. How would we begin? First, we would secure funds to obtain a large supply of identical functioning radios in order to dissect and compare them to the one that is broken. We would eventually find how to open the radios and will find objects of various shape, color, and size (Figure 2). We would describe and classify them into families according to their appearance. We would describe a family of square metal objects, a family of round brightly colored objects with two legs, round-shaped objects with three legs and so on. Because the objects would vary in color, we would investigate whether changing the colors affects the radio's performance. Although changing the colors would have only attenuating effects (the music is still playing but a trained ear of some can discern some distortion) this approach will produce many publications and result in a lively debate..."
Andreas points to diagrams in the article (see below). The first (A) shows how the biologist might view the radio. The schematic (B) shows how engineers or technicians view it:
As I read the article, I was reminded of the wise advice frequently dispensed through the SolderSmoke podcast: Do not look at a schematic as one single circuit. Instead try to see it as a number of subcircuits. Build and test these subcircuits separately. Join them together only after each subcircuit is found to be working.
This is all really interesting. I will share this with my son who is involved now in biological research.
In addition to his day job as a biologist, Andreas is a homebrewer of radios. Here is a pictures he sent to us back in 2019 of a regen receiver that he built:
Andreas asks if he might need an old Boatanchor radio to work on to improve his electronics/physics skills. I'd suggest staying away from the older tube stuff. Stick with the BITXs -- homebrew one, stage by stage. And indeed, use the engineering approach to the electronics!
This is a really wonderful book. I'm glad worldradiohistory.com has found a way to make it available as a free download. This is the kind of book that you want to download and keep available for future study. The day will come, for example, when you will want to understand how Einstein's special relativity explains how that transformer in your rig actually works. F.A. Wilson explains that, and much more. Here is the link:
Wow. This is a very thought provoking program. It is kind of like "Mr. Roger's Neighborhood," but with science. The lessons provided by Mr. Wizard are really good, but one shudders to think about doing the these experiments with kids (or even with adults!) in today's world. Here are a few of things that would cause trouble today:
-- Liquid mercury.
-- A big power supply. ("Here Willy, you hold the positive terminal.")
-- Even the sprinkling of iron filings would probably require masks at a minimum.
-- In the end, letting poor Willy drop to the floor when Betsy turns off the electromagnet that was holding his swing in the air.
-- And of course, poor old Mr. Wizard's affinity for the kids would stir suspicions.
We also see a sad and very early example of the influence of advertisers and what they call today "product placement." Note the fairly obvious plug (via Morse Code!) for breakfast cereal. In the credits you will see that the program was sponsored by "The Cereal Institute." What next kids? Cigarettes?
But there is a lot of virtue in this program: The development of the telegraph key, Morse Code, CW sidetone. Unlike many of the Box Top Extras of today, young Betsy was not afraid to wind a coil.
We should all embrace the spirit of Mr. Wizard. We are, after all, the International Brotherhood of Electronic WIZARDS! These experiments reminded me a lot of the Trivial Electric Motor that my son Billy and I made when he was around Willy's age (thanks for the idea Alan Yates).
Thanks to Chuck KF8TI for alerting us to this show. Chuck says this program was an early influence on him, and was one of the things that provided a connection between the theory he was learning in college and the real world of electronic devices.
Many more great programs like this can be found on Mr. Wizard's YouTube Channel:
