A combination of pulleys. P is power exerted on the rope and W is the weight.
International Correspondence Schools A Textbook on Mechanical and Electrical Engineering (Scranton, PA: International Textbook Company, 1897)
1669×4404, 1.2 MiB
388×1024, 52.5 KiB
242×640, 25.6 KiB
121×320, 8.9 KiB