Richardson's handbook of projection (1930)

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978 HANDBOOK OF PROJECTION FOR *— (!)--SvwvvvuJ Figure 382. This is only intended to illustrate the lamp parts and circuit. No attempt has been made to observe relative proportions in the diagram. A — Plate. B — Loop. C — 350-volt battery. D — 10,000 ohms resistance. E — Ammeter. F — Circuit to amplifier and microphone.