The valve was shut by order of the aeronaut, and we descended rapidly.
This was caused by the escaping gas going through the valve.
At the proper intervals the valve is pulled down by the eccentric C.
He gave the valve a turn and the Allison smoothed considerably.
Turn the valve so that it will close the hole in the same way.
The valve was not easy to turn; it seemed fixed with the corrosion of ages.
On releasing the handle the pressure of the water against the valve seats it.
When the handle is turned in either direction the valve is unseated.
Valvular: when two parts join so as to form a valve between them.
This valve was supposed to be used only for repairs, after the pile was damped.