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US Patent: 7,477
Collimating Level
Patentee:
John Locke - Cincinnati, OH

USPTO Classifications:
227/105, 356/249

Tool Categories:
layout tools : levels
trade specific : surveyor

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
James Locke
John Locke, Jr.

Patent Dates:
Granted: Jul. 02, 1850

Patent Pictures:
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Description:
This is a simple hand-held sighting level, such as would be used by surveyors. It uses a refracting plate to split the viewed image, allowing for very accurate reading of level.

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