. Practical wireless telegraphy; a complete text book for students of radio communication . ion coil adjustedsimultaneously until uniform interruptions are secured. Generally with this connection, itbecomes necessary to reduce the length of the spark gap G, and in case a quenched spark gapis employed, to use no more than two or three plates. If a rotary gap is included in the powertransmitter, it must be stopped with the spark electrodes in such position as will afford a dis-charge gap of the correct length for the coil. Since the closed and open oscillation circuitsof the transmitter are alre
. Practical wireless telegraphy; a complete text book for students of radio communication . ion coil adjustedsimultaneously until uniform interruptions are secured. Generally with this connection, itbecomes necessary to reduce the length of the spark gap G, and in case a quenched spark gapis employed, to use no more than two or three plates. If a rotary gap is included in the powertransmitter, it must be stopped with the spark electrodes in such position as will afford a dis-charge gap of the correct length for the coil. Since the closed and open oscillation circuitsof the transmitter are already adjusted to resonance, the complete process of tuning neednot be gone over again, with the exception that the coupling between the primary windingP-1 and the secondary winding S-1 may have to be increased. The ammeter connected in the antenna circuit of this set should read from 2 to 3 amperes,depending upon the electrical dimensions of the circuits of radio-frequency, or, in other words,the type of set. The range of transmission varies from 125 to 225 miles in daylight. ]. AUWLIARV TRANSMITTERCIRCUIT Fig. 205—Tuned Coil Emergency Transmitter. The coil transmitters are generally supplied with the portable chloride typeD-5 accumulator of the Electric Storage Battery Company, but later installationsare equipped with another type known as the 5 K. X. portable accumulator, eitherbattery being of 60 ampere hours capacity. The general instructions given for the chloride battery in Paft V, apply to thebatteries of these sets, and should be carefully observed. It will be noted fromthe diagram of Fig. 205 that the battery can be placed on charge with the induc-tion coil in operation. As a safety measure, to prevent the meter being burnedout by electrostatic induction from the transmitter, the voltmeter circuit containsa small strap key, which must be closed to take a reading of the voltage of the cells. 159. The Electric Storage Battery Companys Accumulators and Charging
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