Improvements in calculating devices for determining the nett price from a primary figure subject to percentage discounts or increments

摘要

706,185. Calculating-apparatus. CURTIS, H. C. Oct. 19, 1951 [Oct. 19, 1950], No. 25435/50. Class 106 (1) A nett-price calculator involving percentage increments and discounts comprises a continuous concentric series of monetary scales la, 1b, 1c and 1d on a base disc 1, a centrally pivoted datum disc 2 bearing percentage increment and discount values 5 and 6 on either side of a datum line 4, and a centrally pivoted cursor 7. The datum 4 is set to the basic price on one of the monetary scales, the cursor line 8 to the appropriate increment or discount value on scale 5 or 6 and the nett price read from the monetary scale at the cursor line. The radial line 9 terminating the scales is marked with arrows to assist reading from one scale to the next. A succession of increments and discounts may be applied to an initial basic price.