INING THE SPEED OF A PHOTOGRAPHIC gallons per second. This represents about 12,000 SHUTTER. horse-power available from the fall. This is to be BY J. IRVING TRACY. raised to 16,000 horse-power by future hydraulic work. A: modern photographic camera is usually fitted with an automatic shutter, which… … cured by transformers having graphed, the product of the water circulation. number of waves by the period
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