Illustrated Catalogue Of Magic Lanterns (after November 1889, probably 1890)

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MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., IT. S. A. PORTABLE ADJUSTABLE EXTENSION SCREEN FRAME. A practicable Portable Extension Screen Frame that can be adapted to all sizes of screens is a great desideratum to the traveling exhibitor. We furnish a portable sectional frame con- structed as follows : It is composed of the required number of sections, each sec- tion being three feet in length, one and a quarter inches in diam- eter, of tough, thoroughly seasoned whitewood. Two of the end sections have a sharp-pointed brad that stick into the floor so that it cannot slip or get out of position; the other two end sections, each have a pulley let into the body of the section through which is carried the screen rope, and is attached to a small screw-eye in the floor in a line with the face of the screen, and at the proper distance from the screen; then two guy-ropes at each side of the screen, one extending forward and one back- ward, serve to hold the screen immovably in place. This device answers admirably for screens up to twenty feet square. Larger screens than this require a heavier frame.