US Patent: 3,226,832
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| Linearity testing gauge
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Patentee:
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| William B. Fell (exact or similar names) - Rockford, IL |
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Patent Dates:
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| Applied: |
Nov. 12, 1963 |
| Granted: |
Jan. 04, 1966 |
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Jeff Joslin
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Description: |
| The invention is a surface straightness gauge akin to the well-known Kingway tool of patent 2,761,217. These types of gauges are used for testing straightness of machine surfaces, especially when building or reconditioning a machine tool such as lathe or milling machine. We have no direct evidence that the inventor, who did business as "Wm. B. Fell Co.", actually manufactured this gauge but we tentatively list that name as manufacturer."It is the principal object of my invention to provide a taut line or wire as the reference for checking for straightness and utilizing a vertical light beam from below the wire in checking for straightness in a vertical plane and a horizontal light beam from behind the wire for checking for straightness in a horizontal plane, the light beam in either case being directed toward two solar cells disposed in closely spaced parallel relationship to one another so that both cells are illuminated equally if the surface is straight, but the shadow of the wire cast on one or the other of these cells acts to decrease the current in one cell when in is cast on either side of center, the amount of variation from a straight or true condition being then readable on a micro-ammeter directly in terms of one or more ten-thousandths of an inch." |
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