Either the air pump or steam may be employed to create a partial void in the receiver beneath the filter.
Now place this apparatus under the receiver of an air pump and exhaust the air.
Put the bell jar on the plate of the air pump and begin to pump the air out of it.
"He has no business to faint when he's working the air pump," he said savagely.
The divers helmet was fitted into position and the air pump started.
There was the fat lady who was blown up twice a day with the air pump.
It one day occurred to M. de la Croix that he ought to try an experiment upon a Cat with an air pump.
The only sound from the students was the faint sound of the air pump.
Does not the air pump, which you used in the experiments, on pneumatics, operate upon the same principles as the sucking pump?
Let us now fix it on the air pump, and exhaust the air from underneath it—you will not be alarmed if you hear a noise?