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DRIVES . 571
drives the lower magazine takeup. Below the gear is an oil well with indicating windows. The large black circle at upper right is the casing of the rotary stabilizer mechanism referred to just below. Under this is the terminal board to which is connected the coaxial cable from Fig. 200 as well as wires carrying Voltages for the photo-electric cell and the exciter lamp. The way in which power is transmitted to the large gear wheel of Fig. 214 can be seen in Fig. 215. The motor shaft is equipped with a worm which meshes with gears above and below. The shaft of the upper of these two gears carries the large gear wheel of Fig. 214. In addition, these two gears of Fig. 215 are shafted to the two sound sprockets at the operating side of the head.
The internal arrangements of the rotary stabilizer are also shown. Inside the ball race is the end of the shaft of the rotary stabilizer drum or cylinder. That drum is driven by the moving film. In turn it drives the flywheel (the large disc surrounding the ball-race, in which three machine screws are mounted). This flywheel is driven only by frictional contact through a film of oil, and in turn steadies the drum shaft rotation through the same slight frictional contact. The result is remarkable steadiness in the rotation of the drum shaft, which in turn is imparted to the film. (The thin outer rim of the rotary stabilizer assembly is physically united with the drum shaft and rotates with it. The oil film mentioned lies between the flywheel and this outer casing.)
Troubles and Care of Motors
(18) The care of motors is discussed in greater detail elsewhere. Here we are concerned only with special items of attention needed by projector drive motors, which amount to little more than exceptional precaution in matters of lubrication and commutator condition, in order to insure that the motor not only runs well, but that its motion is steady and without vibration.
One other matter of exceptional importance in the case of projector drive motors is that of starting torque.