ClipArt ETC
Magdeburg Hemispheres. This model is used to show that atmospheric pressure is equal in all directions. It was invented by Otto Von Guericke, of Magdeburg - hence the name.

Magdeburg Hemispheres

Magdeburg Hemispheres. This model is used to show that atmospheric pressure is equal in all directions.…

"By means of the two hemispheres, it can be proved that the atmosphere presses upon a body equally in all directions. This device was invented by Otto Von Guericke, of Magdeburg, and is called the Magdeburg hemispheres." — Hallock, 1905

Magdeburg Hemispheres

"By means of the two hemispheres, it can be proved that the atmosphere presses upon a body equally in…

"Grease the edges to make more sure of a tight joint, fit the hemispheres to each other, and exhaust the air with a pump. Close the stopcock, remove the hemispheres from the pump, attach the second handle, and, holding the hemispheres in different positions, try to pull them apart. When you are sure that the pressure that holds them together is exerted inall directions, place them under the receiver of the air pump, and exhaust the air from around them. The pressure seems to be removed, for the hemispheres fall apart of their own weight." -Avery 1895

Magdeburg Hemispheres

"Grease the edges to make more sure of a tight joint, fit the hemispheres to each other, and exhaust…