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The Optical Magic Lantern Journal and Photographic Enlarger. 47
of these drums can be conveniently carried in one's pocket, the sensitive film is contained. When attaching one of these drums holding sufliciens film for about 700 exposures, a small length of the film is withdrawn, the drum slipped into place, an? the hinged portion opened as in Hig. IIL.
Fig. Il.
It will then be seen that that portion of the film withdrawn is finely ground, and is not coated with sensitised material; this is passed in front of the lens and inserted into a slot and the apparatus closed. Dy sliding open a slot in the rear and looking through, this small piece of
Fig. I.
film will be found to act the part of a ground glass on which the picture can be focused accordingly. It then suffices to turn the handle, when at each turn nine cinematographic exposures are made. Provision is made for the rapid interchange of films merely by attaching a
second drum, detaching the mechanism portion
as in Fig. IV. and attaching the other end of the body, which is divided longitudinally into two compartments. When these two compartments are filled they can be quickly emptied by opening the side of the drum, attaching thereto the end of film seen in last figure to be protruding, holding the drum (lid closed) to the
Fig. IV.
light trapped opening, turning the winch handle with which it is provided, and by this means rewinding it into the drum. This, we may say, is all done in less time than it takes to describe.
For printing transparencies froin the nega tives a special receptacle is supplied with the apparatus. This holds two films, the negative and sensitised film, which pass in contact
Fig. V.
at the lens hole; the sensitised film passing into the body in the manner spoken of when taking negatives, and the negative film going straight down into a basket or box held below. Filing so exposed can be readily developed by the amateur with a developing outfit supplied by the makers. This merely consists of a dish