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Updated: May 6, 2025
Many other similar tests were made and the effect was always noted. In some way the message on one line had been conveyed across the air-gap and had been recorded by the telephones on the other line. It was decided that this had been caused by induction. Prof. John Trowbridge, of Harvard University, might well be termed the grandfather of wireless telegraphy.
"You see, son, we must lose one one-thousandth of one per cent of our total energy, and provision must be made for its dissipation in order to avoid destruction of the laboratory. These air-gap resistances are the simplest means of disposing of the wasted power." "I get you but say, how about disposing of it when we get the thing in a ship out in space?
This is done by means of an insulating tube known as a leading-in insulator, or bulkhead insulator as it is sometimes called. As a protection against lightning burning out your instruments you can use either: an air-gap lightning arrester, a vacuum tube protector, or a lightning switch, which is better.
The air-gap and vacuum tube lightning arresters are little devices that can be used only where you are going to receive, while the lightning switch must be used where you are going to send; indeed, in some localities the Fire Underwriters require a large lightning switch to be used for receiving sets as well as sending sets. How to Put Up a Cheap Receiving Aerial.
Broadly speaking, these oscillations arise from disruptive discharges of an induction coil, or other form of oscillator, across an air-gap, and their character is controlled by the manipulation of a special type of circuit-breaking key, by means of which long and short discharges are produced.
It was an "oscillator", a new system for the employment of sound for submarine signalling, using water instead of air as a medium to transmit sound waves. It was composed of a ring magnet, a copper tube lying in an air-gap in a magnetic field and a stationary central armature. The tube was attached to a steel diaphragm.
This is done by means of an insulating tube known as a leading-in insulator, or bulkhead insulator as it is sometimes called. As a protection against lightning burning out your instruments you can use either: an air-gap lightning arrester, a vacuum tube protector, or a lightning switch, which is better.
The air-gap and vacuum tube lightning arresters are little devices that can be used only where you are going to receive, while the lightning switch must be used where you are going to send; indeed, in some localities the Fire Underwriters require a large lightning switch to be used for receiving sets as well as sending sets. How to Put Up a Cheap Receiving Aerial.
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