Clocks and watches need many tiny gears to work. We need clocks every day.
A clothesline uses two pulleys, one at each end. It is a very good use for pulleys and many people use them.
24 in. Adjustable Wrench - the worm gear in the wrench allows the size of the wrench to be adjustable. Very useful !
http://mocomi.com/ presents: What is a Pulley? Pulley is a simple machine and comprises of a wheel on a fixed axle, with a groove along the edges to guide a ...