He could state simple problems: "The air pump is laboring, sir."
Screw the lower section into the hole in the plate of the air pump.
Put the bell jar on the plate of the air pump and begin to pump the air out of it.
After the invention of the air pump this supposition was verified as just explained.
Now place this apparatus under the receiver of an air pump and exhaust the air.
"He has no business to faint when he's working the air pump," he said savagely.
Before putting on his head-piece, he tried the air pump also.
There was the fat lady who was blown up twice a day with the air pump.
The only sound from the students was the faint sound of the air 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?