GB302159A - Improvements in or relating to illuminating arrangements - Google Patents

Abstract

302,159. Rasmussen, H. M. Dec. 10, 1927, [Convention date]. Theatrical appliances.- Theatrioal scenes &c. are illuminated in turn by light rays, the colours and intensities of which would make white light if blended together. A sign so illuminated is shown in Fig. 1, wherein a plate 1 bearing the legend &c. in the form of perforations is illuminated in succession from the rear by lamps A and from the, front by lamps B. The legend thus appears in turn as, say, red spots on a green background, and as green spots on a red background. Fig. 3 is a diagrammatic view of a rotary selector switch which illuminates two or more replica groups of two or more differently coloured lamps a, b, c, a<1>, b<1>, c<1> in a succession of combinations, omitting the combinations in which lamps of the same colour light both sides of the plate. 1 simultaneously. Rotating shafts d, e, f, geared together by pinions differing slightly from one another in their number of teeth, carry commutators j, k, l which are in contact with brushes p. The lead u to the conducting portion of the commutators is through the shafts d, e, f, and their bearings.