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FOR THE AMATEUR gears, the take-up spool, the film register, the shutter shaft, the claw crank and the feed sprocket. There are no other moving parts subject to friction or wear. The shutter is double bladed and makes but one-half a revolution to each complete cycle of the claws, re- ducing the actual speed of the shutter by one-half. The film used is the Pathescope standard 28 mm., non-inflammable film. This film has 20 frames per foot, or a 25% increase over the 35 mm., standard film. The saving in not great, nor would the establishment of a new standard have been justified from this viewpoint alone, but as this film was made for use in home pro- jectors without the use of an enclosing booth it was necessary to provide some means to prevent the owners of such projectors from using the larger inflammable film. For this reason the 28 mm. gauge was estab- lished. The Pathescope film may be readily recog- nized for on one edge it has one perforation only for each frame, this perforation being located directly opposite the frame line. On the other edge it has the usual four perforations, one of which occurs opposite the frame line as in European cameras. The Safety Standard film, as adopted by the Society of Motion Picture Engineers in April, 1918, is the same size and style, but has four perforations per frame on each edge of the film. Thus safety standard may be used in Pathe- scope cameras and projectors, but not vice versa, for the usual safety standard projector has a full-toothed sprocket and the original Pathescope film has no per- foration for these teeth to engage. The Pathescope outfit is not the ideal camera for 33