. Annual report of the Board of Regents of the Smithsonian Institution . Fig. 1.—Harmonic Interrupter for Determining Variation of IntensityWITH Change of Fig. 2.—Wireless Telephone Receiver, with Thin CopperDiaphragm Repelled by Resistance Coil of 16 Ohms.

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840