US Patent: 1,036,601
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| Conbined Level, Plumb and Grade Finder
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Patentee:
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| Daniel W. L. Frank, Sr. (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Oct. 26, 1911 |
| Granted: |
Aug. 27, 1912 |
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Patent Pictures:
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Joel Havens
Martin J. Donnelly Antique Tools
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Description: |
| Munn & Co.- patent attorneys
My invention relates to improvements in combined plumbs, levels, and grade finders, and it consists in the combinations, constructions and arrangements herein described and claimed. An object of my invention is to provide a device which will combine in one instrument several different instruments for use .in finding levels, grades, directions, etc. A further object of my invention is to provide an improved means for finding grades or determining the angles of slopes. This I do by means of what I term an " inclinometer," which is used in connection
with the level, compass, etc. A further object of my invention is to provide means for protecting spirit levels
from dust and injury, and at the same time to provide means for magnifying these spirit levels so that they can be easily read. A further object of my invention is to provide means for lighting the spirit levels, these means consisting of electric lamps which are enclosed within the instrument adjacent to the spirit levels and by the use of which the spirit levels may be observed at night.
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