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"The air pump is an instrument for removing air from a given space. A closed vessel R is called the receiver, and the space that it encloses is that from which it is desired to remove the air. It is usually made of glass, and the edges are ground so as to be perfectly air-tight. When made in the form shown, it is called a bell-jar receiver." — Hallock, 1905

Air Pump

"The air pump is an instrument for removing air from a given space. A closed vessel R is called the…

"The air pump is an instrument for removing air from a given space. A closed vessel R is called the receiver, and the space that it encloses is that from which it is desired to remove the air. It is usually made of glass, and the edges are ground so as to be perfectly air-tight. When made in the form shown, it is called a bell-jar receiver." — Hallock, 1905

Air Pump

"The air pump is an instrument for removing air from a given space. A closed vessel R is called the…