Fig. 1,033 and 1,034.—Wiring diagrams showing proper methods of wiring for illuminating a painted sign. The lamps are placed about one foot apart in an overhead inverted trough. They should project out in front of the sign one-half its width, but no sign should be more than eight feet wide, as ordinary 16 c.p. lamps will not carry any farther. Black and white paint only should be used. The lamps may be flashed on and off as a whole, saving one-half the current, or they can be flashed in different colors as desired. For flashing in colors, only red and amber should be used. No other colors, such as green, blue, etc., will give sufficient light to produce a good effect.
The call itself consists of two or more sheet steel boxes, one of which is shown in [fig. 1,032], with incandescent lamps arranged in metal compartments in such order that any number may be produced by lighting the proper lamps.
Fig. 1,035.—Operating keyboard for three number National carriage call. The keyboard here shown is designed to control a three number call, there being a row of keys for each monogram or unit of the call. Its dimensions are 4 inches deep, 18 inches wide and 19 inches long. The base is of slate. There are fourteen wires for each monogram and one return wire, coming out of the call.
The flashing of the number is controlled by a keyboard or switch which may be placed in any convenient location. When the switch and call are connected together, any numeral may be flashed by pressing the corresponding key. The numeral automatically remains lighted until the releasing button is pressed.
Fig. 1,036.—Clock monogram or electric sign clock, operated by the mechanism shown in [fig. 1,037].