. Electrical instruments and telephones of the Signal corps . Fig. 181. As in all the instruments of this type, the frame is on one side of thecircuit, and the tripod legs should be wii)ed thoroughly (hy hefort-making a test. This ])recautionarv measure should always be taken. The .sensibility of this instiument is 3()() megohms. This is deter-mined by the fact that one volt through one megohm will deflect themirror oOO scale divisions. Figuie 180 shows construction of thisinstrument. 100, Hox. The box is a circular rubl)er case having mountedtherein 10 coils Avo
. Electrical instruments and telephones of the Signal corps . Fig. 181. As in all the instruments of this type, the frame is on one side of thecircuit, and the tripod legs should be wii)ed thoroughly (hy hefort-making a test. This ])recautionarv measure should always be taken. The .sensibility of this instiument is 3()() megohms. This is deter-mined by the fact that one volt through one megohm will deflect themirror oOO scale divisions. Figuie 180 shows construction of thisinstrument. 100, Hox. The box is a circular rubl)er case having mountedtherein 10 coils Avound with No. 40 B. & S. manoanin wire. Should ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS, 261 trouble occur with this device the proper-sized wire will be found inthe spare-parts case. This box is held together with two screws.(Fig. 181.) COMBINED SHUNT AND KEY. This shunt and key, or button, takes the place of the usual Ayrtonshunt, battery, key, and short-circuit key. Its connections and gen-eral construction are shown in tiaure NO ZO B»S Phosphor Bronze - Kubbercovered
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
