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US Patent: 46,348
Improvement in Parallel Rules
Patentee:
E. C. Gillette - Richfield, BC Canada

USPTO Classifications:
33/454

Tool Categories:
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Dav. B. Chisolm
G. F. Lee
M. M. Livingston

Patent Dates:
Granted: Feb. 14, 1865

Patent Pictures:
USPTO pdf tiff
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Description:
This is perhaps the most complicated parallel ruler ever invented. It features a rack and pinion adjustment that drives a worm gear driving a second pair of racks, each attached to a scissor joint connecting the two rules.

The inventor claims this tool to be more accurate and less likely to get out of alignment. but I think these benefits would be dwarfed by the fragility of the mechanism.

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