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US Patent: 67,269
Improvement in Slides for Rules, Scales and Tables
Patentee:
F. J. Coffin - Newburyport, MA

USPTO Classifications:
235/69, 235/85R

Tool Categories:
rules : rule attachments

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
L. A. Coffin
J. S. Brown

Patent Dates:
Granted: Jul. 30, 1867

Patent Pictures:
USPTO pdf tiff
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Description:
This design is for a metal slider that can be used to accurately read from a rule or scale that has multiple scales printed on it. One of the patent pictures shows it being applied to a log rule, but it could also be used for a gunther scale or slide rule.

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