US Patent: 99
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| Compasses Quadrant and Protractor
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Patentee:
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| Francis Whiteley (exact or similar names) - Standardsville, Orange County, VA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Dec. 06, 1836 |
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Joel Havens
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Description: |
| Abstract:
It is formed with two rules, or scales, and a quadrant, or quarter circle attached to one rule, and a back pointer to the other. The quadrant has the degrees marked on it from 0 to ninety, and by opening the rules which are fastened at the center by a screw, the back pointer will mark the degrees on the quadrant. There is a long, square, or oblong box which is fastened to either of the rules by a screw contain a magnetical needle which may be readily, changed from one rule to the other when using the instrument as a compass; in running the southwest or northeast courses, the box containing the magnetical needle must be on the left hand rule, or that attached to the quadrant, and in running the southeast and northwest courses, the compass box must be on the other rule. Now by setting the back pointer to the course called for, and move the instrument till the needles settle north and south you have your course. The staff used is such as is generally used by surveyors, with the exception that there is a notch in the socket _so that the ball may be turned 85down at right angles from the perpendicular so that the compass will be changed to a- quadrant. The lower rule being leveled by the plumb or spirit-level, and by elevating, or depressing the upper scale until it cut the object the quadrant will mark the 40 degrees of elevation, or depression> There are two sets of sights, one set on each rule.
Claim:
The manner of constructing this instrument with double sights upon two rules; or scales as herein described, furnished. with a box containing a compass needle constructed in the manner, and adapted thereby to the purposes herein set forth, and I also claim the manner of arranging the socket, and ball as to allow the instrument to be used as a quadrant. |
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