. Annual report of the Board of Regents of the Smithsonian Institution . Fig. of Heterodyne Receiver Adapted for Use in Telephone Work. Smithsonian Report, 1908.—Fessenden. Plate Fig. 1 .—Apparatus for Balance Method of Talking and ListeningSimultaneously. w ., ^^^^^I^^^^^Jjg^^^g^^^_ - ,.::rr iT^ Wtr^^ -^^fj^^^-^ ^^^^^s^ 1 H^^W ?^ ^SK3J jy^^^a^^^t / tM ? V cp^^pr^ Fig. -Part of Interference Preventer to Eliminate DisturbancesIN Receiver. Smithsonian Report, 1908.—Fessenden. Plate 19.

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840