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Now whenever any pair of electrodes on the rotating disk are in a line with the pair of fixed electrodes a spark will take place, hence the pitch of the note depends on the speed of the motor driving the disk. This kind of a rotary spark-gap is called non-synchronous and it is generally used where a 60 cycle alternating current is available but it will work with other higher frequencies.
When the key was held down for a longer period a long spark passed between the brass knobs of the spark-gap and a dash was thus transmitted. When the key was depressed for a shorter period a dot in the Morse code was sent forth. After much work and adjustment Marconi was able to send a message across the garden.
The plain spark-gap is more suitable for small spark-coil sets, and it is not so apt to break down the transformer and condenser of the larger sets as the rotary gap. The rotary gap on the other hand tends to prevent arcing and so the break is quicker and there is less dragging of the spark. The quenched gap is more efficient than either the plain or rotary gap and moreover it is noiseless.
"Yes, it is working," announced Alice, as they drew near the quarters occupied by the wireless operator and heard the spiteful snapping of the notched wheel of the spark-gap apparatus.
"I'll send them out by the doctor in the morning," said the forester. Charley showed Mrs. Morton how to wire the cells and couple them to the instruments. Then he told her how to adjust her spark-gap and tune the instrument to any given wave-length. He compared his watch with the clock on the wall. "At eight o'clock every night," he said, "I will call you up. Suppose you take Mr.
The only differences which subsist are necessarily those due to the considerable discrepancy which exists between the durations of the periods of these two categories of waves. The length of wave corresponding to the first spark-gap of Hertz was about 6 metres, and the longest waves perceptible by the retina are 7/10 of a micron.
Charley Russell sat before a table in the workshop in his father's back yard. In front of him were the shining instruments of his wireless outfit his coupler, his condenser, his helix, his spark-gap, and the other parts, practically all of which he had made with his own hands. Ordinarily he would have looked at them fondly, but now he gave them hardly a thought.
Under the influence of the electric waves set up from the spark-gap those tiny particles so arranged themselves that they would readily carry a current between the plugs. By placing these plugs with their platinum terminals in circuit with a local battery the current from this local battery was given a passage through the coherer by the action of the electric waves coming through the ether.
With the knowledge that this all-pervading ether would carry electric waves at the speed of light, that the waves could be set up by the discharge of a spark across a spark-gap in a coil, and that they could be received in another coil in resonance with the first, the establishment of a practical wireless telegraph was not far away.
I don't ever want to get into another situation like that without something to shoot with." Charley chuckled. "It wasn't a pistol that saved you then," he smiled, "but Willie Brown and his spark-gap." "Then we'll be doubly armed," replied Lew. "Since you have so much faith in wireless, you can carry the outfit. I'll pack the gun.
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