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US Patent: 21,861
Device for Adjusting to Right Angle Joiners' Squares
Square Adjustment
Patentee:
Linus Yale, Jr. - Philadelphia, PA

USPTO Classifications:
33/475

Tool Categories:
layout tools : squares

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John Hoskin
Richd. Paxson

Patent Dates:
Granted: Oct. 19, 1858

Patent Pictures:
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Description:
This patent describes a new method of manufacturing squares such that they may be easily adjusted to true. It uses a pair of set screws in the head, which move the blade of the square.

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