Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

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140 MOTION PICTURE HANDBOOK When attempting to read a meter, first note carefully the unit in which the dials read. On all meters used by the Edi- son Company, the figures above or below the dial indicate the value of one complete revolution of the pointer, there- fore one division indicates one-tenth of the amount marked above or below. Note the direction of rotation of the dial pointers. Count- ing from the right on a watt meter, the pointers of the first, third and fifth dials rotate in the direction of the hands of a watch, whereas the pointers of the second and fourth dials move in the opposite direction. Similarly, on a kilowatt hour meter the pointers of the first and third dials move in the direction of the hands of a watch, and the pointers of the second and fourth dials move in an opposite direction. The dials must always be read from right to left, and the figures should be set down as read. Always read the fig- ures on each dial which the pointer has last passed or has just covered. Each dial reading depends on the reading of the one next to it on the right. Unless the one before it has completed a revolution or passed the o, the pointer which is being read has not completed the division on which it may appear to rest, and still indicates the last figure passed over. Always ascertain if the register is direct reading, that is, has no multiplying constants. Some registers are not di- rect reading but require that the dial reading be multiplied by a constant in order to obtain the true reading. This is for the purpose of keeping meters of various capacities uni- form in size. If the constant were not used, meters of larger capacity would be much larger and heavier than those of small capacity. If the register face bears the words "multi- ply by Yz" or "multiply by 2," etc., the actual reading should be multiplied by J^ in the first case, or doubled in the second, and similarly for other constants. Next multiply the difference between the present reading and that of the last month by the rate per kilowatt hour you are paying, and you have the amount of your bill in dollars and cents. The accompanying fac similies of meter dials give ex- amples of meter readings which may actually occur in prac- tice. For example, in No. 2, the dial at the extreme right