公开(公告)号：US3556397A

公开(公告)日：1971-01-19

申请号：US3556397D

申请日：1968-12-30

Applicant: DAVID C ANDERSEN

Inventor： ANDERSEN DAVID C

IPC: G06G1/10 ,  G09B23/04 ,  G06G1/00

CPC classification number: G06G1/10

Abstract: A trigonometric calculator with a circular degree scale on a scale member and a cursor member mounted to pivot on the scale member at the center of the degree scale. Coordinate axes with their origin at the center of the scale extend one unit length in each positive and negative direction and are calibrated from zero to one. Hairlines are mounted on the cursor member one unit length from the center of the degree scale for placement parallel the ordinate and abscissa axes. The sine and cosine functions may be directly read from the coordinate axes for any angle indicated by the cursor member on the degree scale. Other scales may be provided on either side of the scale member to indicate other trigonometric information relevant to the indicated angle.