Percent calculator

Details Percent calculator Percent calculator

1973-03-09

1976-03-16

Miller, Jr., George H.

Registers

Calculators

Single axis

235 88M, 235 84, G06C 2700

Patent

active

039447898

ABSTRACT:
This invention relates to a manually operable calculator; used to determine percent scores and to weight tests, comprised of a circular disc having a centrally pivoted rule. The disc has an outer periphery of numerals indicating per cent scores, the radii of numerals below 100 per cent indicating perfect scores, the radii of per cents other than one hundred indicating raw scores, and numerals on the rule corresponding to numerals on the radii below 100 per cent.

REFERENCES:
patent: 1423896 (1922-07-01), Wickoff
patent: 1609571 (1926-10-01), Olson
patent: 2358856 (1944-09-01), Galbe
patent: 2358856 (1940-03-01), Gunning
patent: 2494175 (1950-01-01), Griesbaum
patent: 2544224 (1951-03-01), Hachmuth
patent: 2996246 (1961-08-01), Swanson
patent: 3095144 (1963-06-01), Mims

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