Each was fitted with a Blake, horizontal, direct-acting, vacuum pump.
Tubes which have been evacuated usually are sealed off while they are still connected to the vacuum pump.
This will give a hollow branch which may be cut off at any desired point, and is then ready for connection to the vacuum pump.
One of the tubes is connected to a vacuum pump, and the other with a vessel containing a sufficient quantity of boiled-out oil.
If a tube from a vacuum pump is near the coil the whole of the pump is brilliantly lighted.
The remaining three sides are made of 1⁄2-inch pipe, perforated with holes and connecting to the vacuum pump.
An air-compressor was converted into a vacuum pump, and with this equipment the vacuum filter of to-day came into existence.
The straight part of the side tube is then constricted ready for fusing off and the whole affair is placed on the vacuum pump.
From the point of romance, the world may lose; the vacuum pump cannot vie with the pretty milkmaid of the songs.
I merely removed the air from the jar with a vacuum pump and the little creature passed out of the picture very quickly.