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Updated: June 3, 2025
A suitable tube, having as near as possible the same diameter and wall strength as the one broken off, is selected and a piece the desired length cut off. If the break is very close to the stopcock, very little reheating and blowing can be done, on account of the danger of getting the stopcock sleeve out of shape, and the work must be heated very slowly to prevent cracking.
The steam vessels were connected to this pipe by other valves, also opening upwards, and by pipes. Over the steam vessels was placed a cistern, which was kept filled with cold water. From this proceeded a pipe with a stopcock. This cistern was termed the condensing cistern, and the pipe could be brought over each steam vessel alternately from the boiler.
With care, this may often be successfully done even where the break is within 1/4 inch of the stopcock. The first step is to clean and dry the stopcock, remove the plug, cork the open ends of the stopcock sleeve and the other tube, and wind a couple of layers of asbestos cord carefully over the sleeve and the most of the corks which close it.
But this time she played but a few moments, and when she ceased, Mrs. Legrand's voice was heard faintly calling her. She glided between the chairs in the door-way and entered the cabinet, drawing a portière across its door behind her. As she did so, Dr. Hull touched the stopcock in the wall by his side, turning on the gas in both parlours, and proceeded to unlock and open the hall-door.
Apparently a stopcock inside the boat was letting in water from outside, which overran us and soon filled up the room. Contrived in the Nautilus's side, a second door then opened. We were lit by a subdued light. An instant later our feet were treading the bottom of the sea. And now, how can I convey the impressions left on me by this stroll under the waters.
The reservoir R2 was now again raised until the mercury in R1 stood above stopcock C1. The caustic potash was fused and boiled, and the moisture partly carried off by the pump and partly re-absorbed; and this process of heating and cooling was repeated many times, and each time, upon the moisture being absorbed or carried off, the reservoir R2 was for a long time raised and lowered.
It is well to allow the iron solution to run nearly, but not entirely, out of the funnel before the wash-water is added. If it is necessary to interrupt the process, the complete emptying of the funnel can always be avoided by closing the stopcock. It is also possible to reduce the iron by treatment with zinc in a flask from which air is excluded.
The regular working of the machinery was aided by the employment of a balance-beam connected by a chain with the head of the large piston and pump-rods; and the whole of these powerful machines by means of three of which as much as 789,840 gallons of water were pumped out of the mines every 24 hours were set in operation and regulated merely by the turning of a stopcock.
It will be ground still finer in the process. For the final polishing, a little infusorial earth or even kaolin will do. The surface to be ground is moistened with water and dusted over with a little of the abrasive. The plug is now inserted in the stopcock, and turned with a gentle pressure.
The beginner usually grinds too much, and with too coarse material. As the grinding surface becomes dry, water is added drop by drop, and the grinding continued until the abrasive seems to be reduced to an impalpable powder, most of which has been squeezed out of the stopcock.
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