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US Patent: 941,492
Rule
Combination Rule, Square and Protractor
Patentee:
Patrick F. Burns (exact or similar names) - Nisbet, PA

USPTO Classifications:
33/341, 33/458

Tool Categories:
rules
layout tools : squares
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. J. Monaghan
Grant Stanley
S. M. Gallagher
Francis Alcock

Patent Dates:
Applied: Sep. 18, 1908
Granted: Nov. 30, 1909

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Ralph Brendler
Description:
This tool implements the by now standard combination of ruler-based tools (square, bevel, plumb, etc). The new feature here is the addition of two sliding brass "feet" that fill in the corner of the square.

While these will fill in the corner as specified, they introduce a new problem- the edge of the rule now has a "dip" in it, rendering it a pretty poor square.

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