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Improvement in Air-Cooling Apparatus.

Description: Patent for "the construction and arrangement of a refrigerator for the purpose of cooling and maintaining a low and dry temperature, for preserving fresh meats and vegetables, and for cooling rooms for any purpose." (Lines 10-15) Includes instructions and illustrations.
Date: March 30, 1875
Creator: Hyatt, Frank A.
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Partner: UNT Libraries Government Documents Department

Telephone Transmitter and Receiver

Description: Patent for a telephone transmitter and receiver. The device is for lines "known as 'long-distance' telephones for the purpose of taking up the weakened vibrations and re-energizing them...transmitting them with increased volume" (line 12-15) illustration included.
Date: June 30, 1903
Creator: Sammons, Oliver P.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Reed-Organ.

Description: Patent for a cheap and simple reed-board that provides a uniform tone that is produced through the register or registers and allows the freedom of communication between the reed-cells and pipe or resonance cells.
Date: January 30, 1906
Creator: Preston, Percy C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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