F. H. Richardson's bluebook of projection (1942)

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118 RICHARDSON'S BLUEBOOK OF PROJECTION amperes to projection arc lamps. The smallest, seen at the lower left, is the activating element of the kind of rectifier often used with test meters, such as decibel Figure 55 meters. Its current-carrying capacity is limited to a few milliamperes. (18) Stack rectifiers are usually connected in a "bridge" circuit as diagrammed in Fig. 56, where each arrowhead-and-crossline symbol represents either one complete stack assembly (Fig. 55) or one section of such an assembly. The electrical arrangement is most easily understood by reference to Fig. 57. The arrowheads in TO ARC UNE ( \ 1 , 3 ' /\l + „ TOA.C * LINE **\/ H Figure 56 that diagram do not represent direction of electron motion but direction of current flow according to the conventional idea of current moving from positive to negative. The circuit may be traced accordingly. When the upper a.c. wire is positive, trace through the upper right-hand