Slide 1 moves along fixed guides d-d and carries cam 2 which rotates about axis A of slide 1 and has hand k. Hand k indicates, on dial e of slide 1, the angle of rotation of cam 2 which is proportional to the radius vector of the theoretical, or pitch, curve of cam 2. Follower 3 slides in fixed guide B and carries a pin which slides along the profiled groove of cam 2. Addends proportional to quantity a are entered by traversing slide 1 along guides d-d. Addends proportional to quantity b are entered by turning cam 2 about axis A. The sum a+b is proportional to the displacement of follower 3.
$3116$SmC,MO$