US Patent: 2,363,877


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Theodolite

Patentees:

John B. Sonderman (exact or similar names) - Troy, NY

Harold R. Larsen (exact or similar names) - Troy, NY

USPTO Classifications:

356/139

Tool Categories:

Assignees:

W. & L. E. Gurley - Troy, NY

Manufacturer:

W. & L. E. Gurley - Troy, NY

Witnesses:

Unknown

Patent Dates:
Applied:	Feb. 11, 1943
Granted:	Nov. 28, 1944

Patent Pictures:

USPTO (New site tip)
Google Patents
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"oxtoolco" YouTube video on this Gurley device

Description:

This high-precision device is used to exactly measure angles. See the linked video for an extant example of the Gurley Unisec bearing this patent number, starting at about 10:30.