Percent Calculator (Patent No: 947739)

Inventor: Moffat, Jon L.

Location: Calgary

Comments: N/A

Description: [52] CLASS 235-115
[11] 947,739
[54] PERCENT CALCULATOR
[72] Moffat, Jon L., Calgary, Alberta, Canada
[21] Application No. 136,785
[22] Filed Mar. 10, 1972
5 Claims

[57] This invention relates to a manually operable calculator; used to determine per cent 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 one hundred 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 one hundred per cent.