This medieval elevator shows the use of two simple machines: wheel and axle on the right, and a pulley…
"In some cases it is desired to raise water higher than it can be forced by the pressure of the atmosphere…
"Liquid is pumped up through pipe A, through valve H. The airtight piston G allows the liquid to pass…
"In printing, an iron hammer with a split curved claw at the end which serves for a handle. The claw…
Tongs are gripping and lifting tools, of which there are many forms adapted to their specific use. Some…
"Devices for lifting water are older than written history, and various forms of pumps are used on almost…