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US Patent: 13,993
Proportional Dividers
Patentee:
Henry M. Parkhurst - Perth Amboy, NJ

USPTO Classifications:
33/558.02

Tool Categories:
layout tools : compasses : dividers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. H. Wales
R. W. Fenwick

Patent Dates:
Granted: Dec. 25, 1855

Patent Pictures:
USPTO pdf tiff
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Description:
This is a pretty bizarre set of proportional dividers, which uses secondary legs that project at right angles to the legs, instead of the normal sliding fulcrum.

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