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The example is a base-burning stove, having a fuel-magazine suspended free from the grate, and having an unobstructed free space around and below it, an illuminated casing surrounding it. See baseburning stove.
Hemispheres of brass whose edges are carefully ground together to make an air-tight joint, and designed to illustrate the pressure of the atmosphere.
The experiment originated with the worthy Otto Guericke, burgomaster of Magdeburg, about 1654.
The edges of the hemispheres, being greased with oil or tallow, are brought together, the foot removed, and the stopcock screwed into the center of the air-pump plate.
The cock being opened and a few strokes of the pump made, the sphere is thus exhausted of contained air, and on being removed from the plate and affixed to a duplicate handle is ready for the illustration.
Nearly fifteen pounds of force to the square inch will be required to draw them asunder.
To separate them readily, i