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MANAGERS AND PROJECTIONISTS 1189
fingers. Their tips, which ride upon the film, are of genuine rubies, which gave no evidence at all of" wear after one year of steady use.
At 23 we see the "inside" detector fingers — one on each side. These ride upon the film, under pressure of spring 13, Fig. 432. They have a longer, flatter surface than do fingers 22, they press upon and ride over the center of the sprocket holes.
The gate rails, 24, Fig. 433, also are hardened and chromium plated. Their faces are ground to an absolutely flat surface. 27 is the holes opposite these lower fingers. The gate latch, 26, Fig. 433, is a substantial lock.
In Fig. 434 we have a view of the mechanism contained in base 8, Fig. 431. 36 is the starting handle. 28 is motor belt. 30 is the brake rod. The brake is set automatically and acts both upon the upper reel and the motor. 31 is a mercury switch, the contacts and mercury being inclosed in a vacuum tube. 33 is a movable armature. 34 is a toggle mechanism.
When the starting handle, 36, Fig 434, is raised, several things happen simultaneously. Toggle 34, Fig. 434, is locked in position. Mercury switch 31, Fig. 434, is tipped so that the mercury runs down and forms an electric circuit between two contacts, which starts the motor and energizes the detector box. Armature 33, Fig. 434, is set into position, ready to tip toggle 34 when it is desired to start. Brakes on motor and upper reel are released, all of which happens practically instantly.
The machine now is in operation, and here is what happens. The mechanism passes film down through the detector box until a point is reached where there is a fault of some sort in the film, or if the device be set to stop at splices, a splice comes along.