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Updated: May 7, 2025
The cheapest audion bulb you can buy costs about three dollars." The other boys, also, were pleased with this idea, and said so. They agreed to sell two of their sets as soon as they got back to Clintonia. This was their last week at Ocean Point, for the fall term of the high school started the following Monday, and they were to leave Ocean Point on Saturday.
To the devices of Carty and his associates was added the extremely delicate detector that was needed. This was the invention of Dr. Lee de Forest, an American inventor and a graduate of the Sheffield Technical School of Yale University. De Forest's contribution was a lamp instrument, a three-step audion amplifier. This is to the wireless telephone what the coherer is to the wireless telegraph.
They agreed before parting for the night that they would meet the following day after school at the radio supply store, where they could buy some audion bulbs and whatever other apparatus they might need. "Hello, Bob! what kept you so late?" called Joe.
"Let's go down to the store after school to-morrow and pick out what we need. I want a couple of audion bulbs, and I suppose you fellows do, too. I want to price variable condensers like the one Doctor Dale brought us at Ocean Point last summer, too." "We've got to keep busy if we want to keep ahead of some of the other fellows in this town," said Joe.
These were to be placed on the varnished panels, so that holes could be bored through paper and panel, thus insuring perfect spacing and arrangement. Sketches, also, were made of all details. The audion tubes, storage batteries and telephone receivers had been purchased in the city. Almost all the other parts were made by the boys out of carefully selected materials.
"But not to impulses from outside the hull," he broke in. Unobserved, he had been bending over one of the little instruments which had kept us up all night and bad cost a tedious trip to New York and back. "What's that?" I asked. "This? This is a little instrument known as the audion, a wireless electric-wave detector." "Outside the hull?" repeated Shirley, still dazed.
With more highly perfected appliances, as a vacuum, or audion tube, and an aërial elevated from sixty to over a hundred feet, you may receive radio energy thousands of miles away.
"Now, the audion, as you see, consists of two platinum wings, parallel to the plane of a bowed filament of an incandescent light in a vacuum. It was invented by Dr. Lee DeForest to detect wireless. When the light is turned on and the little tantalum filament glows, it is ready for business.
They're a regular riot all the time they're with us." "Yes, they're certainly funny," agreed Joe. "What were you telling them about selling our sets, just as we came in?" "Oh, I was just saying that we could get money to buy new apparatus, audion bulbs, and that sort of expensive stuff, by selling one or two of the sets we've got now, and whacking up the proceeds," said Bob.
"It can be used for all systems of wireless singing spark, quenched spark, arc sets, telephone sets; in fact, it will detect a wireless wave from whatever source it is sent. It is so susceptible that a man with one attached to an ordinary steel-rod umbrella on a rainy night can pick up wireless messages that are being transmitted within some hundreds of miles radius." The audion buzzed.
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