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Supposing quite naturally that the person calling had a shorter wave, he gradually cut out the inductance of his receiver; but the sound faded out entirely, and he returned to his original inductance and shunted in his condenser, upon which the call immediately increased in volume. Evidently the other chap was using a big wave, bigger than Georgetown. Hood puckered his brows and looked about him.
First connect the free end of the condenser in the aerial to one of the terminals of the stator of the variocoupler; then connect the other terminal of the stator with one of the ends of the bank-wound inductance coil and connect the movable contact of this with the ground.
This is called a fixed, or stationary spark gap and costs about $1.00. The Tuning Coil. The transmitting inductance, or sending tuning coil, consists of 20 to 30 turns of No. 8 or 9 hard drawn copper wire wound on a slotted insulated form and mounted on a wooden base.
You see that I've wound around its entire length, except for about a half inch at either end, a coil of wire. This is called the inductance coil. You will notice that the wire is covered with cotton except for this little strip of wire extending lengthwise where I've scraped the cotton off with sandpaper so as to accommodate the sliding contacts.
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