Antifriction roller systems for a lever
Two roller-and-lever mechanisms giving enormous mechanical advantage
The page develops an antifriction roller system: two diagrams at the top show rollers drawn as small dotted circles carried between arms, and a long staged device runs down the right side. A note explains that the two arrangements are quick and fit for practical men — one works by continuous motion along a single path, the other by a motion that goes and returns, and both are curved. With a pivot one inch thick and a lever of three braccia, giving 72 half-ounces against one, a single pound of force at the lever's end would move 26,873,280 pounds at the foot, against the counter-lever f.
On this page
Two antifriction roller mechanisms
Two roller arrangements are shown, both described as expeditious and fit for practical men. One is made for motion along a single path, the other for a motion that goes and returns, and each is curved. Small dotted circles between the arms represent the rollers that reduce friction.
Lever of three braccia and its mechanical advantage
The first, rotating, motion has its sides as 72 against one — that is, 72 half-ounces against one half — because the pivot is one inch thick and the lever is three braccia. Used to pull a bell, a three-braccia lever with one pound of force at its end would move 26,873,280 pounds at the foot, at the counter-lever f.