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US Patent: 503,528
Pattern Maker's Scale
Patentee:
James T. Cowley - Lowell, MA

USPTO Classifications:
33/494

Tool Categories:
rules : shrink rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jno. Y. Hinkel
A. N. Dobson
Kirby F. Chase
Emma F. Cowley

Patent Dates:
Applied: Dec. 12, 1892
Granted: Aug. 15, 1893

Patent Pictures:
James T. Cowley patent August 15, 1893
USPTO pdf tiff
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Description:
Diagonal lines on the rules represent different percentages of "shrink" to account for shrinkage in brass patterns, iron castings, and combined "shrink" of the two stages, or any other standard "shrink" rates.

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