Field artilleryman's guide; . Portugal. Cuba 257 SIGNALLING Caft. R. G. MacKendrick and ist Lt. C. P. Smith, ist C. Forgie, 2D Lt. W. T. Powers FIELD TELEPHONE AINTD BUZZER Q. Give a general description of the service buzzer. A. The service buzzer is a complete telegraph and telephonecombined. It is packed in a small leather case and weighs,complete, five pounds. The main parts are: batteries (2),induction coil, condenser, line jack, telegraph key, receiverand transmitter, and rocker switch. Q. Describe the working of the buzzer as a telegraph instrument. A. An induction coil consists of
Field artilleryman's guide; . Portugal. Cuba 257 SIGNALLING Caft. R. G. MacKendrick and ist Lt. C. P. Smith, ist C. Forgie, 2D Lt. W. T. Powers FIELD TELEPHONE AINTD BUZZER Q. Give a general description of the service buzzer. A. The service buzzer is a complete telegraph and telephonecombined. It is packed in a small leather case and weighs,complete, five pounds. The main parts are: batteries (2),induction coil, condenser, line jack, telegraph key, receiverand transmitter, and rocker switch. Q. Describe the working of the buzzer as a telegraph instrument. A. An induction coil consists of a primary winding of a fewturns of heavy wire around a soft iron core, and a secondarywinding of very small wire. As current is passed throughthe primary coil, it sets up or induces a secondary current ofhigh voltage in the secondary coil. This current magnetizesthe iron core to alternately attract and release the vibratorso rapidly that a buzzing noise is caused. As varying cur-rents go through the coil, varying secondary currents ar
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Keywords: ., bookcentury1900, bookdecade1910, bookidfieldartille, bookyear1917
