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US Patent: 280,398
Carpenter's Square
Prescott's Patent Carpenter's Square Attachment
Edwin Prescott - Arlington, MA

USPTO Classifications:

Tool Categories:
layout tools : squares : miter squares
layout tools : squares : try squares


The Stanley Rule & Level Co. - New Britain, CT

Jos. P. Livermore
W. H. Sigston

Patent Dates:
Applied: Apr. 06, 1883
Granted: Jul. 03, 1883

Patent Pictures:
USPTO pdf tiff
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Expands the uses for a try-square attaching an auxiliary blate allow it to also be used as a marking gage,marking bevels for moldings, and to mark out square, hexagonal and octagonal miters. The auxiliary blade is soldered to the contact face of the handle.

Known examples are attached to Stanley No 20 Try Square and Prescott's attachment is marked: PRESCOTT'S PATENT CARPENTERS' SQUARE JUL 3, 83

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