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US Patent: 1,420,175
Angle-Measuring Apparatus
Patentee:
Segundo Perez Alonzo - Habana, Cuba

USPTO Classifications:
33/1AP, 33/456

Tool Categories:
layout tools : protractors
trade specific : surveyor

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 09, 1920
Granted: Jun. 20, 1922

Patent Pictures:
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Description:
This device uses simple geometry to bisect and trisect an angle, and accurately measure angles. The patent drawings show it used with a theodolite, as would be used for surveying.

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