To find the centrifugal force of a revolving mass in lb.
Set 2940 on B to revolutions per minute on D; bring cursor to weight in
lb. on B; index of B to cursor, and over radius in feet on B read
centrifugal force in lb. on A.
To find the centrifugal stress in lb. per square inch, in rims of
revolving wheels of cast iron.
Set 61·3 on C to the mean diameter of the wheel in feet on D, and over
revolutions per minute on C read stress per square inch on A.
EX.—Find the stress per square inch in a cast-iron fly-wheel rim 8 ft.
in diameter and running at 120 revolutions per minute.
Set 61·3 on C to 8 on D, and over 120 on C read 245 lb. per square
inch on A.