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US Patent: 376,430
Protractor
Patentee:
Samuel Darling - Providence, RI

USPTO Classifications:
33/426

Tool Categories:
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John E. Hall
A. J. Shaw
Charles H. Schmelz
Socrates Scholfield

Patent Dates:
Applied: Apr. 29, 1887
Granted: Jan. 17, 1888

Patent Pictures:
USPTO pdf tiff
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Description:
This is a design for a draftsmans' protractor that attaches to a standard T-Square. The inventor here is Samuel Darling of Darling, Browne, and Sharpe fame (precursor to the famous manufacturer of machinist tools, Browne and Sharpe), but it is not known if this tool was ever produced by DB&S.

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