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Updated: June 4, 2025
He thrust the end of the stop-cock into the hole. It was screwed fast and the valve turned. This stopped the flow of gas and checked the descent of the ship. Then, by opening the tap the vapor was allowed to escape gradually, bringing the Flying Mermaid gently to the water. As the adventurers approached they could see that the vessel was now a mass of flames.
His first experiments were with a wooden pump and a barrel of water, but he soon found that with such porous material as wood a vacuum could not be created or maintained. He therefore made use of a globe of copper, with pump and stop-cock; and with this he was able to pump out air almost as easily as water. Thus, in 1650, the air-pump was invented.
Estel smiled as she glanced at Sally, to whom the faucet of the water-cooler seemed a never-failing source of amusement. Ellen had put a stop to her drinking, which she had been doing at intervals all the morning, solely for the pleasure of seeing the water stream out when she turned the stop-cock. Now she had taken a tidy spell.
At the bottom of the vat, and in front of it, a large wooden stop-cock is fitted, through which the liquid amalgam is drawn off at the end of the process into another shallow-bottomed and smaller vat, Figs. 1 and 2.
One such boy, after patiently doing his work for many days, contrived to connect this stop-cock with some of the moving parts of the engine by a wire, in such a manner that the engine itself did the work which had been intrusted to him; and after seeing that the whole business would go regularly forward, he left the wire in charge, and went away to play. Such is the story.
Bring me a drill, and a small stop-cock!" The drill was obtained from the engine room. Working rapidly Mr. Henderson bored a hole in the lower part of the holder. As soon as the metal was penetrated the gas, which was under considerable pressure, rushed from the tank with a hissing sound. At once the Mermaid began to settle rapidly. But the professor was prepared for this.
Some of the pieces of brazen mechanism were very beautiful and delicate especially one piece, a stop-cock for letting water into a boiler, the various and complex parts of which, when contrasted with the huge workmanship of the other departments, resembled fine watch-work.
At the end of this time the amalgam is run out through the stop-cock at bottom of the vat, is washed, and is put into hydraulic presses, by means of which the mercury is squeezed out, leaving behind a thick, pulpy mass, composed mainly of silver, and locally termed a "piña," from its resembling in shape the cone of a pine tree.
His remarkable predilection in favour of the use of hydraulic arrangements is displayed in his specification of the surface-planing machinery, which includes a method of running pivots entirely on a fluid, and raising and depressing them at pleasure by means of a small forcing-pump and stop-cock, though we are not aware that any practical use has ever been made of this part of the invention.
This reservoir, which is of boiler plate, is furnished with a cover, D, which has in its center a piece of tubing, with stop-cock, C. A series of tubes, R, whose diameter and length are proportioned to the volume of the boiler, A, is filled with the liquid which is contained in the boiler, so as always to be able to rapidly produce a pressure of nine atmospheres or more by direct heating.
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