Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 151
and rendered conductive by suchdischarges. The length of these gaps is such that the oper-ating voltages in telegraph service cannot initiate arcsacross the spark gaps. In practice, satisfactory fuses and lightning arresters fortelegraph circuits assume a variety of forms, concededlymore or less… … is shown in Fig. i, and is called a peg switch panel or a strapand disc switch panel. The wall panel shown is used wheretwo-line wires pass through an intermediate ofhce, and pro-vides means for introducing either set of receiving instru-ments into either line, for cross connecting, for…
Telegraph
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