A NEW ELECTRIC SIGN.
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Internalite electric sign, which
.I. was shown in the gallery of the Engineering and Machinery Exhibition at Olympia, struck us as offering great possibiliCies for advertising and other purposes on commercial motors. This sign is constructed on an entirely new principle. Our illustration shows the plan clearly. It will be seen that a metal tube is provided to hold the lamp, or lamps, which supply the illumination, and through a slot lengthwise in the tube the edge of the glass screen is passed and secured. These lamps are of the striplight metal filament type, and, being inside the tube, project their rays in a straight line through the edge
of the glass. Were the glass to be merely a plain sheet, nothing would be visible, excepting a slight luminosity at the edges of the glass, where reflection would occur, whilst, should these edges be covered, nothing would be seen of the rays of light from the lamp. To form a sign, the letters necessary for any device for advertising purposes have to be etched into the glass from the back. Such etching can be filled with gold or silver leaf, or with any colours, and can be protected by means of suitable damp-proof material, such as varnish. The rays of light which pass through the plate of glass produce a brilliant illumination of these letters and devices. The remarkable point is that these letters appear brilliantly lighted, while the body of the glass can, if de sired, remain transparent. By this means advertisements could be shown on windscreens, so long as they were not in the line of sight of the driver, For illuminated panels on the sides of motorvans, these screens should prove of exceptional use. The screens can be seen at the offices of the K.F.M. Engineering Cb., Ltd., 40, Long Acre, W.C.