Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 181
nunci-ator. — The annunci-ator is an instrumentused in office buildings, in elevators, etc., etc., for the pur-pose of telling at whatplace the person callingis located. There maybe any number of push-buttons, but the dia-gram (Figure 171) showsan elevator call-systemfor four floors, or forfour… … THE AUTOMATIC ARC LAMP 171 oe bat. *&- <^ Lfl-i ztrr B tz^mr OOH Figure 171. — Wiring Diagramof a Four-point Annunciator. through coils 1, 2, 3, 4, respectively, these wires all beingconnected with one wire which runs to the bell and finallyto the binding-post e. This con- p stitutes the…
Physics
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