US Patent: 7,477 - Collimating Level


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US Patent: 7,477

Collimating Level

Patentee:

John Locke (exact or similar names) - 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.