Manual of Wireless Telegraphy for the Use of Naval Electricians

Cover Manual of Wireless Telegraphy for the Use of Naval Electricians
Manual of Wireless Telegraphy for the Use of Naval Electricians
United States Navy Dept Bureau of Equipment
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Across these points a sliding contact moves, giving as many adjustments as there are turns of wire in the coil. (Flat coils of this type have also been made by the De Forest Company.) PI. XIII shows the Slaby- Arco tuning coil.
The single-roller type consists of a bare conducting wire wound in a spiral groove on an ebonite cylinder. A sliding contact on a rod parallel to the cylinder works in the groove and is pressed against the wire by a spring. By revolving the cylinder different lengths of
...wire are put in circuit and an infinite number of adjustments can be obtained.
The double-roller type is also adjustable to any desired fineness. It has two grooved ebonite cylinders parallel to each other and con- nected so as to revolve simultaneously in either direction, reeling the conducting wire from one to the other as desired.- On one cylinder the turns are insulated from each other, and on the other they are short- circuited so that any desired length can be used.
Single-roller inductances are furnished with Shoemaker sets, double- roller inductances with the larger Fessenden sets.


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