Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 115
insulated with one ortwo layers of silk and con-nected between the brassblocks fitted on the ebonitetop. By removing any of thecircular brass pegs tlie coil ofthe value marked is inserted ;thus in Fig. 80 a total resist-ance of 500 has been placedin the circuit. The pegsshould fit tightly and be… … Fi<;. 81.—Elements cf double woundresistance coils. TELEGRAPH INSTRUMENTS 105 values is illustrated iu Fig. 82. The resistances are 50,100, 200, 300, 400, lOUO, 2000, and srixe a range from50 to 4050 by gradations of 50.
Telegraph
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