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US Patent: 14,396
Improvement in Parallel Rulers
Patentee:
R. Eickemeyer - Yonkers, NY

USPTO Classifications:
33/454

Tool Categories:
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Wm. Tusch
Jos. Geo. Mason

Patent Dates:
Granted: Mar. 11, 1856

Patent Pictures:
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Description:
This ruler/triangle uses a complicated spring-loaded cam mechanism to move the rule a specific distance when depressed. From reading the claims I can't quite figure out how it works, but it is certainly a complex way of accomplishing this relatively simple task.

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