As long as the stopcock is closed the water cannot rise in the inner tube.
At the bottom of the drum there is a stopcock to let off the condensed water.
The plug is now inserted in the stopcock, and turned with a gentle pressure.
When the outer door was open, I opened the stopcock and shut the door.
The pipes are provided with a stopcock and their mouths are closed by a cap.
The stopcock is now turned until only the smallest flame exists.
This movement can be utilized by means of simple mechanical arrangements, to open or close the stopcock of a gas supply pipe.
In the middle of this there is a stopcock situated between the two points where the bar joins the limbs of the V.
In fact, by opening the stopcock the steam which was before superheated steam, has become common steam.
By opening the stopcock and lowering the level tube any desired quantity of the gas can be aspirated over.