Monthly Archives: November 2023

Movies on your Phonograph: 1923

1923NovSciInvThis illustration from the November 1923 issue of Science and Invention fits squarely into the category of very interesting things that never caught on for want of a practical application.

It is a system for showing motion pictures from your phonograph. The phonograph is busy spinning at 78 RPM, and this system allows you to use that phenomenon to project movies. The frames of your movie are printed on the edge of a paper disk which is placed on the platter, just like a phonograph record. Two bright lights shine on the image, and the opaque image is projected through a prism onto the screen.

A single disk will give you a movie of about 1/78 of a minute long. To provide for longer movies, the disk bends up automatically as it passes under the prism, which allows the layer below to be shown.

The magazine refers to it only as the “Jenkins movie machine.” That is probably a reference to Charles Francis Jenkins (1867-1934), a pioneer of early cinema. He went on to television, as the principal of W3XK, the first television station in the United States, which began broadcasts to the general public in 1928.



RCA Tubes: 1938

1938NovRadioRetailingEighty-five years ago, RCA reminded dealers of the importance of the RCA name when it came to tubes. Since the earliest days of radio, RCA had cranked out 35 million tubes, and the public trusted the name.  They were relied upon in industry, and by radio stations, both foreign and domestic.

If you were a dealer, would you want to take a chance on an off brand?  The ad appeared in the November 1938 issue of Radio Retailing.



Emerson Models AX-211 and BM-216, 1938

1938Nov14LifeEighty-five years ago today, the November 14, 1938, issue of Life magazine carried this ad for  the Emerson model AX-211 radio, as well as the model BM-216 radio-phono.  The radio was a five-tube set, and the radio-phono had four tubes (plus a “ballast”).

As you can see, this was a time when people dressed up to listen to the radio.  But you treat it as a formal occasion, too, if the radio provided a whole philharmonic performance from a radio the size of your hat!  According to the ad, this was possible because the sets included a “miracle tone chamber.”  It was the first time the miracle chamber had been offered in a set selling for less than $29.95.  And indeed, they were considerably below that price point.  The radio sold for $9.95, and the radio-phono went for only $19.95.

You could visit your closest dealer.  Or, if you preferred, you could mail the coupon to Emerson, and their closest dealer would bring you a set on approval, with no additional shipping charge.



I’ve Fallen And I Can’t Get Up: 1973 Antecedent

1973NovElemElecOver a decade before Mrs. Fletcher (played by actress Dorothy McHugh) famously told the world that he had fallen and can’t get up,  London engineer Douglas Wells, presumably shown in the dramatic re-enactment shown here, was at work on the problem. An elderly neighbor had tripped and fallen down the stairs of her home. She was found three days later, dead. This inspired Wells to come up with the early prototype shown here. It consisted of a mat which was placed at the bottom of the stairs. If someone fell down the stairs and landed on the mat, it would trigger an alarm bell and lighted “HELP” sign outside the house.

This would, of course, be a great benefit if someone fell on that particular stairway. But it would be of no help if some casualty afflicted the person elsewhere in the house. So the wireless device worn around the neck, hooked up to the telephone line, is probably a better solution.

For those in need of such a system, the first point of inquiry is often your local hospital, some of which provide these systems free of charge. If that’s not an option, one alternative is a medical alert service. They typically supply the equipment at no cost, but provide the service for about $20 per month. So if the person requiring assistance pushes the button, like Mrs. Fletcher, they will speak directly to an operator who will summon the required assistance. You can find a comparison of the available services at this link.

Another option is to purchase equipment similar to that shown here.
It consists of a base unit that connects to the normal landline telephone. If either of the panic buttons is pushed, it automatically dials up to three telephone numbers and plays a prerecorded message. The advantage of this type of system is that the caller ID information is displayed at the other end. So if it’s set to call 911, then the 911 dispatcher will know the location of the emergency. However, it’s probably best to program it to dial the numbers of friends or relatives who can intervene in emergencies, which may or may not warrant 911.

The third option is a system similar to the one shown here.
This small unit is actually a cellular phone. It relies upon the fact that all cellular phones in the U.S., whether or not activated, are required to be able to call 911. In this case, 911 is the only number it will call. The disadvantage is that, since it is not an activated phone, the 911 dispatcher probably won’t have access to your location. But as long as the owner is able to speak, they will be able to tell the dispatcher where they are, and what the emergency is. The phone is turned off until the button is pushed, so batteries (normal AAA batteries) will last a long time, and only need to be replaced once a year or so.

A final option for anyone potentially in need of such assistance is any cellular phone. Again, even if the phone is not activated, it can be used to call 911. One disadvantage is that it does require the user to affirmatively dial 911, which might be difficult in an emergency. Also, batteries need to be charged on a regular basis, which means it’s not something that can simply be forgotten until needed. But since most people have old cell phones lying around, it is a zero-cost option. If you’re worried about someone, simply asking them to put an old phone in their pocket gives some assurance that they can call for help, even if they can’t access their normal phone. In fact, it’s not a bad idea to keep an old phone, along with a 12 volt cord, in your car as a backup communications method in an emergency.

The picture at the top of the page of the 1973 system is from the November 1973 issue of Elementary Electronics.



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1963 British Two-Tube Regen

1963NovPracWirelessSixty years ago this month, the November 1963 issue of the British journal Practical Wireless carried complete plans for constructing this handsome two-tube shortwave receiver. A transformer and solid state rectifier allowed it to be run from the AC mains. An acorn tube served as detector, with a dual triode supplying two stages of audio amplification for loudspeaker volume.

The set could tune 1.2 MHz to 100 MHz (or even lower, although each band would be quite narrow). For general use, the magazine suggested a coil covering 7-22 MHz, and perhaps a second one for 2-5 MHz. Coils could be wound on old tube bases, and complete coil data was included.

Since the set was designed for beginners, the blueprint also included a wealth of data useful new SWL’s, such as a list of stations, frequency allocations, and the Q-code.

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Comet Kohoutek: 1973-74

1973NovPSShown here, in the November 1973 issue of Popular Science, is an artist’s conception of what Comet Kohoutek was going to look like in early 1974. According to the magazine, the comet was going to be the “Sky Spectacular of the Century” as it made its way from the Oort Cloud , close to the sun, and within view of the Earth.

It was going to be a big deal. William Safire wrote in the New York Times:

A hundred years from now, how will our great, great grandchildren remember 1973? In a future age, when the names of Nixon and Brezhnev are dimly remembered, and those of Ervin and Mitchell and Dean are minor footnotes in scholarly treatises, the name and the discovery that will illuminate the 1973 will be Lubos Kohoutek (the Czech astronomer who discovered the comet).

This magazine, and many other media outlets, gave numerous pointers on how to view this celestial event.  Unfortunately, the comet’s path close to the sun proved to be its downfall, and despite the hype, it was barely visible.



1923 Safety Tip

1923NovPSThis illustration appeared in Popular Science a hundred years ago this month, November 1923. And it’s still not bad advice. We sometimes say that when doing electrical work, among other precautions, you should keep one hand in your pocket. If one hand inadvertently comes in contact with high voltage, you don’t want to be touching a metallic object with the other hand, because the current will pass through your heart.

The light switch you’re flipping today is UL Listed, and nothing could possibly go wrong, right? We’re sure for the Chinese manufacturer, your safety is the paramount concern. But still, it’s not a bad idea to make sure you’re not touching anything else when you reach for a light switch, or anything else that’s potentially energized.



1973 Homemade Christmas Gifts

1973NovPM1Times might be tough, and during tough times, even Santa Claus requires a little bit of help. Fifty years ago, America was going through some tough times, thanks to the Arab Oil Embargo.
Help, in the form of the WIN Button, wouldn’t be available until the following year.

For some Americans, if there were to be Christmas presents under the tree, then they would1973NovPM2 have to make them themselves. Fortunately, the November 1973 issue of Popular Mechanics showed how to make some great gifts for the entire family, using simple materials, with modest skills.

The earrings shown at right, for example, are carved from either wood or plexiglass. In fact, most of the designs shown in the magazine were two-dimensional, meaning they could simply be cut with a jigsaw, and then sanded.

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The youngsters would enjoy either the pull-toys or the wooden trucks shown below.

 

What girl wouldn’t love the toy kitchen set shown below, all crafted with love by Dad in his wood shop.  And to help Junior brush up on his numbers from 1 through 5, this entertaining device shown at the bottom of the page could be built, and Junior could plug it in to any 120 volt household outlet. When a button (switches from refrigerator doors were recommended), a Christmas-tree light would illuminate the corresponding number. Junior 1973NovPM6would have hours of fun, would have a solid understanding of the numbers 1 through 5, and Mom and Dad could laugh at OPEC for trying to steal Junior’s happy Christmas.

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Expedient Phono Cartridge: 1943

1943NovRadioCraftEighty years ago, wartime parts shortages meant you couldn’t just walk into the store and buy parts for your radio or phonograph. Occasionally, substitutions were necessary, and they sometimes required a bit of ingenuity to make them work.

Such was the case for one John J. Leap of New York City, who sent this idea in to the publishers of Radio Craft, where it was published in the November 1943 issue. The pickup on his phonograph had gone bad, and the replacement was unobtainium. Therefore, he made his own, using a headphone and the reproducer from an old mechanical phonograph.

The stylus was soldered to the diaphragm of the headphone, which was used in the place of the original mica piece in the reproducer. The combined unit was then mounted to the original tone arm.

The editors of the magazine decided to duplicate the idea, and they found it to give good results both in quality and volume.



Ergonomic 1938 Radio

1938NovPSThis young woman is now a centenarian, but in November 1938, she was shown in that month’s issue of Popular Science showing off the latest in ergonomic radio receivers. This pushbutton set (the brand name of which is not shown) could be used in two configurations. With the radio sitting on one side, the controls were handy to those who were seated. But tipped up, the radio was easily tuned by a person standing.