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536 <MXKMATOGRAPHIC ANNUAL
Returning to the American productions, we have the well-known Q. R. S.-DeVry, which is one of the most popular of the lighter 16mm. machines. It is of conventional design, mounted on a base which houses the motor, controlling rheostat, single-picture clutch, and the elevating feet. The lamp-house is placed at the side, its beam being focussed on the film by means of a prism reflector; this firm having been one of the first to use such a construction. It is
The DeVry Projector.
also almost the only American projector capable of being handcranked in case of need. The film movement is positive, though actuated by only one claw. Rewinding can be done either by motor or by hand. The lamp supplied is either 100-Watt or 200-Watt, as desired.
The latest entry in the field of home movie projection is the exceedingly neat and efficient Atnpto projector. This is made in two models, one using a 200-Watt lamp and the other a special 2 50Watt one. The optical systems are such as to get the absolute maximum of screen illumination out of either of these sources. To this end the lamp-house is placed conventionally behind the film. The other units are arranged conventionally, but the internal construction of the machine strikes a new note, inasmuch as all gear trains are arranged so that metal runs against fibre, reducing noise and minimizing wear. The movement is unique as it has a 9J/2 to 1 ratio, and an entirely new type of tension system, which consists of two independent edge-tension plates operating within the main pressure-plate. This arrangement, by controlling a considerable length of film on either side of the aperture yields greater steadiness with lessened wear on the film. The centralized controls of the Ampto are also unique. All the controls — the switch, the forward-reverse control, and the speed-controlling rheostat are