Operation and adjustments of the automatic three wire telephone (1915)
Decker, Benjamin Harrison · leaf 99
uencies.The fret^uencies selected were the 16, SS, 50 and 56 cycles persecond. In common practice 66 cycles is about the highestfrequency that can be used for successfully ringing a bell soprogressive numbers were to give four frequencies and have themremoved as far as possible from each other. A… … -silts ~is»^rv\T^ ^ -4&- and description of one ringer will be given, and following thatthe essential differences between the different station ringersthemselves. Reference will be made to Figure 10 in the discussion A. Construction. The ringer coils are screwed to the ringer frame parallelto…
Telephone · Theses
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