US Patent: 13,993 - Proportional Dividers


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US Patent: 13,993

Proportional Dividers

Patentee:

Henry M. Parkhurst (exact or similar names) - 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:

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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.