Principle and construction
The use of highly effecient quartz crystal plays an important role in the “TIMEGRAPHER”. The exacting signal standard obtained from use of the crystal is compared with ticks of the watch and the accurate result is recorded.
The frequency of the crystal is 5,280 cycles (5,280 vibrations per second), and reduced to 60 cycles to synchronize with the motor. The motor turns the spiral roller (with 2 projections) at a speed of 15 or 16.5 rev. per second, the desired speed being selected by the crystal selector switch.
The tick of the watch activates the printing bar, which records the difference as compared with the frequency standard time by striking the prejection of the spiral roller.