Author Archives: clem.law@usa.net

Happy Arbor Day!

The official date for Arbor Day can vary from country to country, and even state to state. So for a website of international scope, we must decide on a date, and we’ve decided to go with Nebraska, which proudly proclaims that it is the home of Arbor Day, and where Arbor Day is a civic holiday. So today, the last Friday of April, we wish you a Happy Arbor Day!

The illustration above is from Boys’ Life, April 1926, and is in the column of Dan Beard. Beard first discusses the possibility of every patrol in the country planting a walnut tree with a walnut from the grave of Theodore Roosevelt, and Beard had distributed thousands of such walnuts, ready for planting. The BSA was also working with the proper authorities to procure walnuts from the grave of George Washington, so that those could be planted as well. There are trees around the United States from walnuts from Mount Vernon, so with some inquiries, this project would probably be quite possible today. For those desiring faster satisfaction, you can purchase a number of heirloom flower seeds directly from the estate.

The other idea shown in Beard’s article is shown above. It’s rather self-explanatory, and involves weaving the trunks of small trees together. Beard recommends species with smooth bark, such as beech, willow, or soft maple. He had some success with chestnuts, but he noted that was the boundary, as species with a rougher bark would not cooperate. For students with a long timeframe, it might make a good science fair project, but “it only takes a few years to get results.” (Emphasis added.) The process is known scientifically as insoculation.



“The Chimps” 1951 Television Films

The youngsters in this picture are now octogenarians, but 75 years ago, they were the test audience for “The Chimps.” They are shown in the April 23, 1951, issue of Broadcasting, which explains that the series of 13 15-minute films had been produced by Bing Crosby Enterprises, and featured chimpanzees in “western and whodunit dramas.”

Try as we may, we have been unable to find much information about this early television program. We’ll keep looking, but if anyone has any information, we would be most interested in learning. And, of course, we would really love to watch an episode or two.



Build Your Own Scope: 1951

Seventy-five years ago, the April 1951 issue of Radio Electronics showed how to construct your own oscilloscope. The magazine pointed out that many were daunted by the prospect, but a basic scope for work on AM and FM radios was well within the capabilities of the average builder. The model they show used five tube, including rectifier, plus the CRT.

These days, you don’t need to break out the soldering iron or track down those five tubes. You can go to Amazon and get a pocket-sized version.



Some links on this site are affiliate links, meaning that this site earns a small commission if you make a purchase after using the link.

Motorola 3A5 “Playboy”, 1941

Eighty-five years ago this month, the April 1941 issue of Radio News showed the Motorola model 3A5 “Playboy.” The four tube (plus rectifier) portable radio was said to play anywhere, and the manufacturer backed up that promise: The set would play where other personal portables failed, or the customer’s money would be refunded.

The set measured 6-1/4 x 4-5/8 x 3-1/2 inches, and weighed in at 4-1/4 pounds. It started playing automatically when the lid was snapped open, and shut off when closed. It was “encased in a crackle finish metal case of modern design with shimmering chrome trim and a front cover of Polystyrene, the new plastic.”



1926: Los Angeles Airmail Service

Shown here is Miss Marion Voss, private secretary to George E. Cryer, Mayor of Los Angeles. She is holding a letter to Mayor Jimmy Walker of New York. The letter is said to be the largest ever sent by U.S. Mail. It is being sent on the occasion of the first airmail flight from Los Angeles, and appeared 100 years ago today in the April 17, 1926, issue of the Washington Star.



Free Energy–Harness the Power from Radio Broadcasts, 1951

Seventy-five years ago this month, this curious ad appeared in the April 1951 issue of Popular Science. It invites you to send $5 ($62.84 in 2026 dollars) to Scientific Products of Indianapolis (conveniently headquartered in a Post Office box), and they will send you copyrighted instructions showing you how to build this radio powered motor. You turn the motor until voices or music are heard from it, courtesy of the proverbial strong local station. At that point, you can listen to it like a radio, but it keeps spinning, thanks to the energy taken from that station.

The skeptic will note that this device doesn’t provide very much energy. It can keep feebly spinning, and you can probably listen to the broadcast at low volume indefinitely, assuming you’re close enough to the station. But they thought of that. They did the impossible by making the tiny prototype, and now it’s up to you to make it more practical. And you can earn “$10,000” if you can pull it off. They include a “royalty agreement,” meaning that if they can commercialize your idea, you will make money. And more importantly for them, they will make money from your hard work.

We’re sure that many of our readers have independently come up with the same idea–using power from a nearby radio station to power up a small device. But we also know that there’s a limit to it.  The only references to “Scientific Products of Indianapolis” were similar ads in other magazines during about the same time frame.  They must have had a bit of capital to run all of those ads.  Let’s hope that not too many suckers sent them $5.



1946 Solar Capacitors

This ad appeared 80 years ago in Radio Craft magazine, April 1946. We decided to get at the real backstory of how this young woman found her way into a capacitor ad, so we asked Google Gemini, who delivered this logical explanation:

In 1946, the world was finally trading in its olive drab for something with a bit more chrome. But for the boys down at the local radio shop, the “atomic age” was more than just a headline—it was sitting right there on the counter in a tailored trench coat.

Her name was Sarah, though behind her back, the consensus was that she was a total bombshell. She had a way of walking into a room that made every vacuum tube in the shop feel like it was about to red-plate.

She stepped up to the counter, reached into her pocket, and pulled out a cigarette. Before anyone could reach for a Zippo, “Sparky” Pete leaned over with his soldering iron. He offered the hot, tinned tip with a steady hand; she leaned in, took a light, and blew a cool plume of smoke toward the “No Smoking” sign.

“My portable,” she said, her voice like velvet. “It’s got a hum that won’t quit.”

She reached into her other pocket and pulled out a radio so small it seemed impossible. It was a sleek little set, the kind of miracle the magazines promised once the factories stopped making tanks.

Sparky popped the back off the set and whistled. “I see the problem, Miss. Someone tried to fix this with some old-fashioned, oversized wax paper caps. They’re crowding the chassis. In a set this small, that’s just asking for a meltdown.”

He reached for a yellow-and-black box on the shelf labeled Solar. He pulled out a handful of “Little Giant” MINICAPS. They were tiny, gleaming, and looked like they belonged in a watch, not a radio.

“You see these?” Sparky said, holding one up to the light. “These Solars are the real deal. During the war, they were the only thing tough enough and small enough to go into the proximity fuses of the actual bombs we dropped. If they could survive being shot out of a cannon and still trigger an explosion at the right microsecond, they can certainly handle your favorite swing station.”

He went to work, his iron dancing across the terminals. He cleared out the bulky, outdated components and tucked the Solar units into the tight corners of the chassis. They fit like they were born there.

“The military spent millions perfecting these so they wouldn’t fail under fire,” Sparky explained as he snapped the case shut. “Now, they’re the only reason you can fit a five-tube performance into a pocket like yours.”

He tuned it to the local station, and the music came through crystal clear—no hum, no hiss.

Sarah tucked the radio back into her coat. The lines of her pocket remained perfectly smooth, thanks to the space saved by the Solar tech. She gave the boys a wink that was more dangerous than a high-voltage rail.

“Thanks, boys,” the bombshell said, heading for the door. “It’s good to know the same stuff that won the war is now keeping me in tune.”

“Well,” Sparky muttered to the guys, “I guess it’s true what they say: it takes a set of those ‘bomb’ capacitors to keep a bombshell from having a blowout.”

Google Gemini was also kind enough to supply these Amazon affiliate links.  If you make any purchase after using one of these links, this website earns a small commission.

Gear Up Your Workbench

If you’re looking to do some “bombshell” level restoration of your own, here are a few essentials for the modern radio bench:




First Man in Space: 1961

Yuri Alekseyevich Gagarin. Wikipedia photo by Mil.ru, CC BY 4.0,

Today marks the 65th anniversary of the first human flight into space by Soviet Cosmonaut Yuri Gagarin aboard the Vostok 1 spacecraft, on April 12, 1961.  Vostok 1 was Gagarin’s only space flight.  Soviet officials were worried that a hero of the Soviet Union might die in a mishap in a later flight, so they grounded him.  Ironically, he was killed in 1968 at the age of 34, in a crash of the MIG fighter he was piloting in a training mission.



1941 Receiver Using Rectifier Tube

Eighty-five years ago this month, the April 1941 issue of Popular Science showed how to build this receiver. It’s essentially a crystal set, but instead of a crystal, it uses a 25Z5 rectifier tube. Since there is no B+ voltage in use, the magazine assures that there will be absolutely no hum. Also, it’s safe to ground the set, because there is no connection to the power, other than to light the filament.

Instead of 25 volts, the filament is powered with 5 or 6 volts, which is obtained by dropping resistors, and/or a “curtain burner” cord.



1946 Japanese Production of “Abraham Lincoln”

At first glance, this appears to be a picture of Abe Lincoln upset by being provided with a map produced by AI hallucinations, as he points accusingly at Nouth Calorina. He probably hasn’t even noticed that the Dakotas are there, despite not being admitted to the Union until a quarter century after that fateful night at Ford’s Theater.

But the map is actually the result of artistic license by the producers of the Japanese production of John Drinkwater‘s play Abraham Lincoln. And that’s not Honest Abe; it’s actually actor Chojuro Kawarasaki playing the role. The photo appeared in the April 8, 1946, issue of Life Magazine, which notes that this was the first such production since long before the war, at Tokyo’s Imperial Theater. The play was “very carefully tailored for Japanese playgoers’ consumption,” and the theater was off limits for American GIs. Despite wearing elevator shoes, the 5 foot 7 actor was unable to get up to Lincoln’s 6’4″.

The magazine noted that “many Japanese, including Emperor Hirohito, have recently been professing themselves great admirers” of the Great Emancipator. Audiences were reportedly “large but not house-packing.”

While we don’t have a video of the Japanese production, the 1952 CBS-TV Studio One production can be viewed at the following link: