The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 171
0 ohms. Tubular or Ironclad Drops.—Fig. 158 shows a 146 PRACTICAL TELEPHONE HANDBOOK form of drop extensively used and designed specially forring-off or clearing drops. It is usually wound to 1000ohms resistance, and it differs from the drop just described inhaving but one long coil, m, which is… … 158.—Full size lever are similar to those of the 2-coil drop, so that Fig. 157serves as elevation of both kinds. As the magnetic circuitis of very small reluctance the drop is very sensitive, and hasgreat impedance, for which reason it must always be insertedas a shunt to a speaking circuit, and…
Telephone
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