A compound lever translates the small movement of a piano key to the fast, hard strike of the hammer on the stringsA piano key is a compound lever of the first-class, since the fulcrum is between the weight to be moved and the power.
12.
A compound lever translates the small movement of a piano key to the fast, hard strike of the hammer on the stringsA piano key is a compound lever of the first-class, since the fulcrum is between the weight to be moved and the power.
13.
1741 : John Wyatt, mechanic and inventor, designs and constructs a cart-weighing machine, later referred to as a compound lever weighing machine; the design works by way of levers that hold in place a platform, no matter where the weight is placed the load is transferred to a central lever.
