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

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FOR MANAGERS AND OPERATORS 39 rent which reaches the lamp must first pass through all the resistance in two or more rheostats one after the other, Fig. 17. I think this is simple and plain enough to require no further explanation, except to say that adding rheostats in series reduces the current. Multiple puzzles many, however, and I will explain it fully. Fig. 18 is a diagram of two water pipes connected together with two valves, and the effect is precisely the same as connecting rheostats in multiple (Fig. 19). By opening both valves you get just double the quantity of water through into pipe No. 2 that you would with only one valve open, just as you get additional current to the capacity of each rheostat added to multiple. I jUfCLY W/^f r/c 19 < think a little study of Figs. 17, 18 and 19 will make this matter clear to you. It certainly ought to. Some rheostats are composed of a number of separate "cells," each cell being in itself a complete rheostat. They are really