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MANAGERS AND PROJECTIONISTS
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current carrying washer into the fourth grid, down which it flows, and so on through all the grids.
The connections of such a rheostat are as follows: 11, 8 and 9 are the binding posts. Usually there are but two, but in this case there are three. The reason for the third post will be explained further along. Between binding post 11 and post 6 of the dial switch is a copper wire connection indicated by dotted line 12. The current passes from binding post 11 along this wire to post 6 of the dial switch, along lever 7 of the dial switch and into the contact the lever of the dial switch is on at the time, whence it flows into the grids of the rheostat as follows : If the dial switch is on contact 1 (the left-hand contact) the current will flow through the switch, through contact 1, into and along the
GC=TOP OF COILS A= RHEOSTAT FRAME B=BOLT
SHADED PART= MICA INSULATION
Figure 140.
wire into binding post A, which connects with grid one, whence it must follow its appointed path through all the grids, if the other wire is connected to binding post 9, which connects with the bottom of the right hand grid at binding post G. Binding post 9 is for use on the voltage the rheostat is designed for. Binding post 8 is designed for use where the voltage of the current is a little lower than the rheostat is supposed to be used on, for instance, 100 instead of 110. It connects, as will be seen, with binding post F. If the connection be made to binding post 8 it has the effect of permanently eliminating the two right-hand grids, thus lowering the value of the fixed resistance of the rheostat.
Suppose the switch is on contact 1 and the projectionist desires to increase his amperage. He moves the switch to