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MANAGERS AND PROJECTIONISTS 705
The Simplex Projector
THE Simolex projector is made in one model only, and is equipped with any one of the following types of light source and lamphouse, viz : "Type S," "Type N," Incandescent, High Intensity or the Peerless Reflector Arc lamp. There are also many attachments, special devices and equipment fully described in the company's literature.
The Type S lamphouse is constructed of heavy Russian iron. The doors (one on each side) are double walled, with" a halfinch air space between the walls through which a' current of air passes constantly. The general ventilation of the lamphouse is excellent.
Fig. 253 illustrates the Type S lamphouse. Its dimensions are : Front to back, 26 inches ; width, 13.5 inches ; height from floor to top, 27 inches.
At the top is a vent, so arranged that connection may be made with a pipe leading either to the outer air or to the projection room vent flue. The maximum possible distance center of condenser can be placed from aperture is 19 inches, the minimum 10 inches. As shown in Fig. 253, the condenser casing swings outward on hinges to allow the projectionist quick and convenient access to the lenses for cleaning or replacing. The casing is locked rigidly in place by moving a single lever. Each lens is carried in a cast iron ring, and is retained therein by a threaded collar. These rings act as a heat and cold reservoir, equalizing the expansion and contraction of the thin edge and thick center of the lenses.
The arrangement is an excellent one, but we would recommend the purchase of at least one extra ring, so that an extra collector lens, or even an extra collector and an extra converging lens, may be mounted in rings, all ready for instant installation in case of necessity.
CAUTION. — When placing lenses in the rings do not screw the retaining collar down too tight. Leave it just a little bit slack, else there wilt be no room for expansion, and the lens may and probably will bind and break. The ring and the threaded collar are shown in lower corner of Fig. 253.
Type S lamp is illustrated in Fig. 254. It is of rugged, rigid construction. It, of course, has all the necessary, usual