Portable Two-Way Radio Weighs Five Pounds
Suspended from the shoulders and strapped around the waist, a compact radio transmitting and receiving set, battery-operated and weighing only five pounds, is now being tried out by New York City police officials. A microphone is attached to the vest.
Drawing Pictures Over the Radio Broadcast Is Latest Fad
THOUSANDS of radio listeners are joining in on the fun of the latest broadcast noveltyâ€”drawing pictures over the radio. The artist in the studio sketches his model in front of the microphone, making the drawing on a chart ruled off into many squares. Radio listeners provide themselves with a similar chart, and when the artist announces that the line he is drawing passes through a certain numbered square, his audience duplicates the line on its own charts. The result is somewhat similar to the drawings subdivided into tiny squares which are printed in the How-to-Build-it section of Modern Me-chanix and Inventions for home craftsmen to copy.
Home on a Hemidemisemiquaver*
*Your quick interpretation â€”a 64th note, or for instance, a “dot” in Code ..
Wings shot-up… motor conking… radio half gone â€”yet a hemidemisemiquaver signal conies through to guide our fightin’ ham home.
Did you think all those Wi-Fi hackers had invented the cantenna? This has them beat by a good 45-50 years.
- Airmen’s “Can-Tenna”
At the Altus Air Force Base in Oklahoma there’s a short-wave antenna that proves you should never throw away anything! It is the antenna for a Globe King transmitter and is made of 84 beverage cans that have been soldered together, end to end. Its height is 27 feet, 10 inches, about a quarter wave length of the 40-meter band.
- Color Converter for Black-and-White TV
Black-and-white TV sets are converted to full color by an adapter that costs about $150 plus installation. The adapter includes an electronic circuit to reduce the
black-and-white picture to 12-inch size. A rotating filter, electronically synchronized, stands in front of the set to add full color to the picture.
Phone Switch Shuts Off Radio
RADIO listeners know what a nuisance it is to try to talk over the phone while the radio is running full blast. Manufacturers have come to the rescue, however, with a switch which automatically shuts off the radio when you lift the receiver to your ear. This switch is contained in a base on which the phone rests, as shown in the accompanying photo. Switches for both French and upright type phones are available at the option of the user.
It seems to me that if the two scientists from “Firm A” are geeking out about their work and not paying attention to the “Sweet Young Thing” then they deserve to lose any secrets they may have.
Electronic Mata Haris
Watch out for that girl, laddie; you might be talking over her head but into her microphone.
AS Willie Shakespeare once said, – “There’s more to this than meets the eye!” This, in the present case, happens to be the bodice of a Sweet Young Thing, said bodice containing microphone, batteries, antenna and transmitterâ€”constituting a miniature radio station with a range of 200-300 feet.
This is pretty interesting indication of how recent our idea of “privacy rights” are. Apparently people were so curious as to what others were saying on the phone line that they would tap into them and listen in. This caused the voltage to drop and the signal to degrade. The solution? Add pre-installed, high-quality phones where they could “officially” listen in.
Phone Designed for Eavesdroppers
TELEPHONE companies are much concerned by eavesdropping on rural party lines because it interferes with transmission over the line. To take down the receiver increases the electrical resistance of the circuit.
It is proposed to stop fighting the apparently incurable tendency of rural subscribers to listen to other people’s business and to recognize it by installing special telephone instruments to which eavesdroppers can listen without increasing the electrical resistance of the circuit or interfering with its legitimate use.
It seems like having to have a belt drive connect both the transmitter and receiver might be a bit of a limitation, but this is still pretty neat. I wonder what the results looked like?
Simplified Electric Picture Transmitter
A COUPLE of sardine and salmon cans, a few bits of brass and several pieces of wood are all the materials that are needed to assemble an experimental but very practical picture transmitter and receiver.
Two of each of the cans will be needed. The salmon cans should be of the small or half can size and the end that has been opened should be replaced by soldering in water tight, a new disc of tin.
It would be so cool if airmail really worked this way.
Chicago’s Airmail Pick-up Catapults Mail Bags To Planes
DRAWINGS revealing the operation of the pick-up device used at the 1934 Century of Progress in delivering and receiving mail from planes in flight have been revealed by the inventor, Dr. Lytle S. Adams of Chicago.
Most ingenious feature of the device is the method by which the incoming bag is released and the outgoing mail tossed into the air. As the plane flies directly over the chute, the comparatively fragile wire dangling from the plane is broken at the mail bag as it reaches the end of a narrowing chute in the pick-up device, releasing the bag. A steel ball on the dangling wire trips a lever which catapults a new sack out of the chute and into the air. Shock absorbers on the plane take up any jars not offset by the catapult when picking up a new bag of mail.