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In this diagram, A represents an outer light-tight box containing a lens, C, and the other necessary mechanism for making the photographic exposures, H<1S> and H<2S> being cases for holding reels of film before and after exposure, F the long, tape-like film, G a sprocket whose teeth engage in perforations on the edges of the film, such sprocket being adapted to be revolved with an intermittent or step-by-step movement by hand or by motor, and B a revolving shutter having an opening and connected by gears with G, and arranged to expose the film during the periods of rest.
Finally the use of the tug was secured, cameras were loaded with the reels of sensitive film, other reels in their light-tight metal boxes were packed for transportation, and shipping cases, so that the exposed reels could be sent to the film company in New York for developing and printing, were taken along.
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