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Updated: May 1, 2025
Only the power was lacking. With the axe he pried off the lid of the box containing the battery, tore away the paper and excelsior wrappings, and in another moment had his wires around the binding posts. He threw over his switch, and springing to his key pressed his finger on it. A brilliant flash shot between the points of his spark-gap.
He set up poles at the opposite sides of the garden and on them mounted the simple sending and receiving instruments which were then available, using plates of tin for his aerials. He set up a simple spark-gap, as had Hertz, and used a receiving device little more elaborate. A Morse telegraph-key was placed in circuit with the spark-gap.
We know how the Bonn physicist developed, by means of oscillating electric discharges, displacement currents and induction effects in the whole of the space round the spark-gap; and how he excited by induction at some point in a wire a perturbation which afterwards is propagated along the wire, and how a resonator enabled him to detect the effect produced.
Differing from a spark-gap transmitter you cannot get any appreciable results with a low voltage battery current to start with. For a purely experimental vacuum tube telegraph transmitter you can use enough B batteries to operate it but the current strength of these drops so fact when they are in use, that they are not at all satisfactory for the work.
"Willie might be listening in," he explained, as the sparks began to leap between the points of his spark-gap. Twice he called, then a bright smile came over his face. "Got him," he said. For some moments he alternately worked his key and listened to the return buzzing in his receiver. Then he turned to the ranger. "Willie has the forester on the telephone," he said. "What shall I tell him?"
Finally their outfit was reduced to two fishing-rods, one hatchet, a first-aid kit, a flash-light, the necessary food and dishes, one canteen, and one pistol, with the wireless equipment. This was made as simple as possible. Six new dry cells were to be taken to provide current. Then there were a spark-gap, a spark-coil, a key, and a detector, with the receiving set, switch, and aerial.
Lew rekindled the fire in the little stone fireplace they had built and Charley uncovered the wireless instruments and sat down on one pack bag. The other he flung to Lew. Then he slipped the receivers on his head, threw over his switch, and sent the bright sparks flashing between the points of his spark-gap. "CBWC CBWC CBWC CBC," he rapped out. Then he sat in silence, waiting for an answer.
"It's a slower way to talk," said the ranger as he watched Charley adjust his spark-gap, "but I can see that it beats the telephone all hollow. Why, a wind-storm, or a snow, or a thunder-storm can put the telephone out of business quicker than you can say scat, and it may take hours and hours to find the trouble and remedy it. I guess you couldn't put the wireless out of commission, could you?"
These wires were on a reel, and would he uncoiled as the balloon arose. The earth-end would be attached to the telephone receivers and to the apparatus, consisting of a spark-gap wheel and other instruments designed to send into space the electrical impulses that could be broken up into dots, dashes and spaces, spelling out words according to the Morse or Continental code whichever was used.
In order that the phenomenon be produced it is necessary that the remaining waves should be previously polarized. This is because, in fact, the mechanism employed to produce the electric oscillations evidently gives out vibrations which occur on a single plane and are subsequently polarized. We cannot therefore entirely assimilate a radiation proceeding from a spark-gap to a ray of natural light.
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