f the magnets; have the of the transmitter is closed, the spark passes between glass tubing, with some silver and nickel filings be- the oscillators, waves are sent invisibly through space tween the ends of the wire at the point, 7. by the aerial and earth plates, and radiating in every The brass… … the apparatus except the coherer, it may be purchased time to permit the heavy lever to regain its normal Fig. 3.—SET OF RECEIVING APPARATUS FOR WIRELESS TELEGRAPH. of any dealer in electrical supplies. The sounder, on position. the left, is an ordinary Morse sounder of 4 ohms re- All these various…
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