Registers – Calculators – Single axis
Patent
1973-12-17
1976-02-10
Tomsky, Stephen J.
Registers
Calculators
Single axis
235 88R, G06C 2700, G06C 300
Patent
active
039379302
ABSTRACT:
A rotary calculator is disclosed for use in site grading applications and other surveying operations involving the conversion of rod readings to datum or sea level elevations, the determination of depths of cut or fill required for finish grading, and the calculation of material quantities to be moved. The baseplate of the calculator is provided with an annular rod reading scale, and a circular conversion unit is concentrically mounted on the baseplate within the rod reading scale. The unit employs three annular elevation scales covering the units and tens digits, the hundreds digit, and the thousands digit of elevation respectively, and three independently rotatable, coaxial discs align the elevation scales in a manner to convert rod readings radially aligned with the units and tens scale into corresponding elevations relative to a predetermined reference elevation, such as mean sea level. A top disc member overlies the conversion unit and is provided with an annular depth scale graduated to indicate depth of cut and depth of fill, and with material quantity information arranged in concentric circular arrays radially aligned with corresponding graduations of the depth scale. A pointer is rotatable about the common axis of the assembly and has a radial hairline used in visually aligning the scale readings.
REFERENCES:
patent: 1262635 (1918-04-01), Cady
patent: 1461449 (1923-07-01), Mathieson
patent: 2477556 (1949-07-01), Shaw
patent: 3369745 (1968-02-01), Merz
patent: 3432927 (1969-03-01), Springer
patent: 3745658 (1973-07-01), Raneses
patent: 3747846 (1973-07-01), Long
Chase D. A. N.
Tomsky Stephen J.
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