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35 grams 5C-2 transmitter amount ampere Associated Electric Laboratories Automatic Electric Company back contact calculated Chicago coil common portion constant contact arms contact closes decibels deflection of contact diaphragm double contact spring electrodes equation factors of safety Figure 17 front contact Gauge gives grams per contact granular carbon handset improvement impulse period impulse relay impulse speed impulses per second inch 20 increase induction coil lagging leading contact line current magnet operation manufacturing mechanism Monophone transmitter noise oscillograph percent break plunger probability of failure pull curves rate of aging ratio record relay requirements release magnet circuit rotary magnets second contact short lines shortest impulse shown in Figure shows side tone reduction single contact spring designs stiffness Strowger Switches Strowger two-motion switch switch magnet TABLE OF CONTACT telephone set total pressure trans transmission loss transmitter design transmitters and receivers vertical magnet voltage volume wipers