Geometrical instruments – Straight-line light ray type – Body related
Patent
1974-09-19
1976-01-27
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Body related
33277, G01C 1500
Patent
active
039343537
ABSTRACT:
This invention relates to surveying instruments of the type by means of which measurements relating to deviation from a true level line, distance, vertical angles, linear alignment of points at various elevations, horizontal angles and the like may be obtained. The instrument comprises a rigid transparent plate or plates containing a mirrored reflection surface. The plate is suspended from a point on the vertical axis through the center of gravity of said plate, and a hairline extends across said plate and mirrored reflection surface in a direction perpendicular to the vertical suspension axis. A set of calibrated marks and a vertical datum line coinciding with or parallel to the vertical suspension axis are imprinted on the plate above and below the hairline. The hairline acts as a horizontal datum line and is used together with the calibrated marks and vertical datum line to determine relative measurements of level, distance, vertical angles, linear alignment and horizontal angles by direct observation or sighting through the instrument.
REFERENCES:
patent: 1336010 (1920-04-01), Wingate
patent: 1455347 (1923-05-01), Merritt
patent: 1723456 (1929-08-01), Zak
patent: 2519727 (1950-08-01), Yezdan
patent: 2562241 (1951-07-01), Picard
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