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US Patent: 243,214
Acoustic telephone
Patentees:
Henry J. Colburn (exact or similar names) - Fitchburg, MA
Irving W. Colburn (exact or similar names) - Fitchburg, MA

USPTO Classifications:
181/138

Tool Categories:
specialty tools : communication apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 08, 1881
Granted: Jun. 21, 1881

Patent Pictures:
USPTO (New site tip)
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Description:
"This invention relates to improvements in acoustic telephones; and it consists, first, in combination with the vibratory diaphragm of a central button head of which is made concave on its under side, where it rests against the outside of the diaphragm, or against a rubber or other washer or packing interposed between it and the diaphragm, by which arrangement we obtain a true bearing of the said button on the diaphragm, as well as an increased supporting-surface for the said button around the central perforation in the diaphragm. The button has an inwardly-projecting perforated shank, as usual, to which the wire is attached which is led to a corresponding acoustic telephone at the other terminus. In combination with an acoustic telephone we employ a lightning-conductor, which is carried from any suitable part of the ring or case to the ground, so as to establish a proper ground-connection to conduct the lightning to the earth in case it should strike and follow the connecting-wires between the telephones."

This patent is of interest because the inventors also made machine tools and woodworking machinery.

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