Slide 1 can be moved in either direction along fixed guide C and carries two identical pulleys 3 which rotate about axes N and M of the slide. Slide 2 can be moved in either direction in fixed guide D and carries four identical pulleys 4 which rotate about axes D, E, H and F of the slide. Flexible link 5, designed as a steel band, is attached to the base at points A and B, and runs over pulleys 3 and 4. One addend a is entered by moving slide 1 and the other addend b is entered by moving slide 2. The sum 2(a+b) is indicated by index c which is attached to flexible link 5.
$3552$CFL,MO$