A Convenient Lantern-Slide Exhibition Rack

Abstract

Figures 1, 2, and 3 show a lantern-slide exhibition rack, on which a large series of slides may be displayed at one time. The rack is made from 28-gauge galvanized iron and 1-inch angle iron. The glass used is flashed opal on one side. The H-shaped horizantal rods for the sides are milled from aluminum rods 1/2 by 3/8 inch thick and are attached to the upper angle irons. The first and last aluminum rods are milled on one side only. The standard size slides (4 by 3 1/4 inches) are slid into place through the grooves, where they are held firm by a notched aluminum lock strip. The reflected light is furnished by four 30-watt bulbs under the glass and fixed on the sides of the frame. A concave metal reflector, painted white, is attached to the sides of the frame. This metal-sheeting reflector starts at the top of the frame, in the back, follows the angle iron 10 inches, curves to a maximum depth of 12 inches, then up to the lower portion of the reviewing stage. The upper portion of the reflector, in the back, is perforated so as to allow the escape of the heat from the bulbs. This rack holds 63 lantern slides and one can study the illustrations with much ease. Castors are attached to the legs, making the rack mobile. On the top of the rack there is a perforated aluminum support to which descriptive cards may be attached. The dimensions of the rack are 6.5 × 30.5 × 20.5 inches.