Invention of the first vacuum pump

Torrey removal USES mercury column inversion to create a vacuum on the top of the glass tube. People call it torrey removal vacuum. It can be said that this is the earliest method to obtain a vacuum. When his discovery became known, many experiments were carried out to study the phenomenon. In 1647, for example, a French physicist named g. Robenval did an interesting experiment in which he took the fish's air bladder out of the belly of a carp, drained it as much as possible, fastened the opening and placed it in the toritelli vacuum. As a result, the fish expands. This experiment convincingly shows that the residual air left in the fish's air pocket at atmospheric pressure expands to a large volume when the external pressure drops to zero. Soon a book was written commenting on this experiment, suggesting that air is elastic, like a sponge or wool, contracting under pressure and expanding when the pressure is reduced.
Gerrick also discovered a vacuum without knowing about torricelli's experiment: his experience was fascinating. One day, he let the family use the water in the pump suction barrel, in the process of extraction pump off. They have to tie it with a cloth, as the stuffing too severe, barrel mouth sealed, the results of the air in the stab also smoke, only heard the noise of a boiling inside: rick was inspired from it, with copper spherical shell instead of wood tong. Let family using pump suction, family smoking more and more difficult. The only listened to peng, copper ball fall flat.
In 1654, to demonstrate the pumping experiment to the public, glick arranged two eye-catching performances. Because he was then mayor of the German city of madeburg, the two experiments were called the madeburg hemispheric experiment. In one experiment, two tightly buttoned hemispherical metal shells were pulled apart by 16 horses. In the second experiment, a pair of displaced hemispheres were suspended from a scaffold and could withstand very large loads. Glick did not provide an explanation for the cause of suction, his contribution. The vacuum pump was invented. The mayor of madeburg caused a sensation in Germany, and when the news reached the other side of the English channel, there was a stir, and many more experiments were done. One of them was the famous Boyle;

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