US Patent: 1,420,175
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| Angle-Measuring Apparatus
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Patentee:
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| Segundo Perez Alonzo (exact or similar names) - Habana, Cuba |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 09, 1920 |
| Granted: |
Jun. 20, 1922 |
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Ralph Brendler
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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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