The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 127
Fig. 101.—Scale Fig. 102.—Scale \ … Scale \ plates, with saw teeth connected to the two-line terminals,are fixed close to, but not touching, a metal plate having agood earth connection, as shown in Fig. 101. If this formis well made, with the teeth milled so as to be sharp pointedand these teeth are adjusted to within about 4mils of…
Telephone
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