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Telephone-Transmitter.

Description: Patent for a telephone-transmitter "with a diaphragm and carbon button carried thereby, of a spring-supported flaring conical carbon-cell provided with a flange covered with soft material and resting on the carbon button carried by the diaphragm, the carbon-cell being filled with granulated carbon resting in contact with the carbon button" (lines 13-19). This is meant to optimize the volume of sound being transmitted.
Date: October 20, 1896
Creator: Alexander, Horace C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

[Letter from R. T. P. Allen to J. D. and D. C. Giddings - October 20, 1871]

Description: Letter from R. T. P. Allen to J. D. and D. C. Giddings. Colonel Allen writes that he needs to collect some notes on behalf of Helen L. Carmer from the Giddings brothers, who received the notes from the late Allen Lewis. Mrs. Carmer also would like the brothers to take up the matter of a claim on the Female College Boarding House in Chappell Hill between $2,000-$3,000.
Date: October 20, 1871
Creator: Allen, R. T. P.
Item Type: Refine your search to only Letter
Partner: Southwestern University
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