With reference to a pulley system, the work equation is clearly discerned in its practical operation. In presenting the pulley, the writer uses a rectangular frame about two feet high and three feet wide. A number of hooks are screwed into the top cross piece of the frame. With such a device a number of different pulley combinations can be shown at one time.
©1929 by Iowa State Teachers College
"The Simple Machines,"
Science Bulletin: Vol. 2:
3, Article 7.
Available at: https://scholarworks.uni.edu/science_bulletin/vol2/iss3/7