An Automatic Photoelectric Triggering Mechanism for a Data-Recording Camera (Classic Reprint) - Softcover

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Excerpt from An Automatic Photoelectric Triggering Mechanism for a Data-Recording Camera

One difficulty encountered in early models of the system was the fragility of the triggering mechanism used to trip the pulse-operated camera and other auxiliary equipment. Trig gering was accomplished by a micro switch mounted on the conveyor chain (green chain) and depressed by boards moving on the chain. As the repeti tious physical impact of the boards on the switch made it vulnerable to breakage, it was necessary to install an additional manually operated push button switch parallel with the micro switch. This switch permitted trig gering the photographic data recording system on command in case of micro switch failure. The switch was also used whenever spacing between boards was not sufficient to permit the microswitch to reset after each photo graph. A triggering mechanism of this type required the full attention Of one man.

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