Radio Pen writes letters of fire on far-away screen
By George H. Waltz, Jr.
CATHODE-RAY tube, having a phosphorescent screen, makes it possible to broadcast to a distance messages that can be read as fast as written
SWEEPING across a mysterious screen like an invisible pencil, a beam of electrons recently penned the message of welcome that opened the National Electrical and Radio Exposition in New York City.
Seated before a small black box, Clarence L. Law, president of the New York Electrical Association, wrote his official greeting with a pencil-shaped stylus. Simultaneously, in a far corner of the exposition hall, the words of his message flashed across a screen in glowing script. As though guided by some unseen hand, a weird green spot traced out the luminous letters of fire just as they were written. This was the first public demonstration of the latest wonder of scienceâ€”the cathode-ray pen.
The Birth of a Station
THE hush of early morning is broken only by the staccato beat of an isolated gasoline engine in a tent in an alfalfa field just beyond the city limits. A sleepy radio operator reads the meters of a portable transmitter arid makes an entry in his log. “One more hour,” he yawns, “and the job is finished.”
On the other side of town a mysterious looking car pulls up at a corner. The driver reads the street names, marks the spot on a map, then snaps on a complicated looking receiving set hung from the roof behind his seat. No sound comes forth. Instead, the needles of two meters swing across the scales. Rotating the loop aerial protruding through the roof, the driver secures maximum reading, makes a note of it, then goes on down the street.
Radio Beam Guides Girls in Blindfold Race
Five blindfolded co-eds at the University of Cincinnati recently competed in an odd foot race, guided only by the beams from a radio beacon set up on the campus. Each girl taking part in this unusual contest carried a small receiving set and wore earphones through which the guiding signals were heard. The signals transmitted were of two kinds like those used to guide planes on commercial airways, one indicating to the contestant that she was following the true course and the other telling her that she was wandering astray. The girls had little difficulty finding their way to the spot where the transmitting antenna had been temporarily set up.
Invading Sailors in Gas Masks Carry Radio Transmitter
Playing at “war” on the English coast, a landing party of sailors representing the invading enemy donned gas masks and went ashore at Studland Beach near Swanage, to be met by a small defending party of British soldiers. The sailors carried a portable radio transmitter with a self-contained receiver to maintain communications with their supporting navy.
Broadcasts Game as He Plays
A PLAY-BY-PLAY account of a basketball game, broadcast by one of the actual players during the contest, recently went on the air at Cleveland, Ohio. For the radio stunt, the player-announcer carried a short-wave transmitter that required no trailing wires, and the central radio studio picked up and rebroadcast his exciting description of his own plays and those of his team mates and opponents. The picture shows him in action.
Edison’s Magnificent Fumble
By ROBERT D. POTTER
AMERICA’S No. 1 inventor just missed one of the greatest inventions of all time. But he discovered the clue that enabled others to perfect it.
Most of those who currently celebrate the 100th anniversary of the birth of Thomas Alva Edison at Milan, Ohio, on February 11, 1847, remember him for his electric light, talking machine, and moving pictures.
Many recall, too, his stock ticker, multiplex telegraph, storage battery, fluorescent lighting, and Portland cement.
Perhaps few, in contrast, ever heard of the Edison effect, to which we owe the vacuum tube and the marvels built around itâ€”radio, television, radar, electron microscopes, atom smashers, and unknown wonders still to come.
Radio Robot Squirts Out 3 a Minute
A COMPLETE radio set every 20 seconds is the production goal of this new British automatic machine known as ECME (Electronic Circuit Making Equipment). Nearing completion at the research laboratories of Sargrove Electronics, Ltd., this automaton uses the sprayed-circuit technique to do the jobs of a double line of skilled workers. Wiring mistakes are eliminated, and the machine even makes its own tests, signaling the location of any defects in the circuit.
Plastic plates are fed into each end of the two parallel rows of electronic units shown in the photograph at the top of p. 160. As the plates move down the line, all the necessary inductances, capacitors, resistors, and potentiometer tracks are “built up.” After lacquering, other units automatically insert rivets, eyelets, and studs. When two plates are joined together at the end of the line, they form a complete radio receiver except for a few parts such as electrolytic condensers, tubes, and loudspeaker, which are added by hand. It is claimed that the sets will be both lighter and sturdier than those made with wired circuits.
Radio Set Is Mother of Chicks
NOT to a radio expert but to a housewife, Mrs. Johannes Ronn, of Kansas City, Mo., goes the honor of putting to useful service the heat emanating from tubes in a radio set. What she did in effect was to make the set do duty as an incubator. She placed the eggs in a pasteboard box and put the box in the radio. After the proper lapse of time four little brown chicks opened their eyes to the world. The chicks will have the unprecedented honor of calling a radio set their mother.
What Are the Facts About FM?
A few years ago, prominent radio engineers “proved” by mathematical and other means that the periodic banging and crackling of static in your loudspeaker could never really be eliminated. They were wrong. For the development of a system of radio broadcasting known as FM (frequency modulation) has not only conquered the static bugaboo, but has given birth to other innovations that may well cause a revolution in America’s $4,000,000,000 radio industry. What are the facts about FM? This article answers the questions most frequently asked.