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"He had a face like the boy to whom you gave the lucky pot," he said. "Did you notice it in the moonlight when the trooper struck him down?" "Yes," she answered. "I saw." They left Bobruisk next morning. They rode away on a great, puffing, snorting train that terrified Anna. The engineer turned a stopcock as they were passing the engine, and Anna screamed while Ivan nearly dropped the big trunk.
When a new bulb was put on, the mercury was always raised above stopcock C1 which was closed, so as to always keep the mercury and both the reservoirs in fine condition, and the mercury was never withdrawn from R1 except when the pump had reached the highest degree of exhaustion. It is necessary to observe this rule if it is desired to use the apparatus to advantage.
A !pipette! may consist of a narrow tube, in the middle of which is blown a bulb of a capacity a little less than that which it is desired to measure by the pipette; or it may be a miniature burette, without the stopcock or rubber tip at the lower extremity. In either case, the flow of liquid is regulated by the pressure of the finger on the top, which governs the admission of the air.
The reservoir R2 could be raised and lowered by a wheel and rack, and the range of its motion was so determined that when it was filled with mercury and the stopcock C2 closed, so as to form a Torricellian vacuum in it when raised, it could be lifted so high that the mercury in reservoir R1 would stand a little above stopcock C1; and when this stopcock was closed and the reservoir R2 descended, so as to form a Torricellian vacuum in reservoir R1, it could be lowered so far as to completely empty the latter, the mercury filling the reservoir R2 up to a little above stopcock C2.
Velvet carpets, large panes of plate glass, hot and cold water that came for the turning of a stopcock, illumination that burst forth as by magic, mirrors that showed the whole person and reduplicated the room even doorbells and sliding doors, and dumb waiters and speaking-tubes, were things that filled her with astonishment.
The nature of this stroke may be judged by the familiar instance where the relatively slow-flowing stream from a hydrant pipe is suddenly choked by closing the stopcock. Unless the plumber provides a cushion of air to diminish the energy of the blow, it is often strong enough to shake the house.
Considering it was a single-roomed place and used for cooking, washing, sleeping and everything else, it was wonderfully tidy, although, to say truth, there was little in it after all to occasion untidiness: a stove, a pot, a frying-pan, an enamelled tin teapot, some crockery, a table, an oil lamp, three chairs, the brass-bound trunk, two wheat-flake boxes and Jake's bed, with one other addition, a fifteen-gallon keg with a stopcock in it and set on a wooden stand close to his bunk.
The house and all that concerned it became his hobby. It was to him what the Mollie D. had been, the primary interest of his life. He knew every inch of plumbing; where every shut-off, valve, ventilator, and stopcock was located. Moreover, he could have told, had not his jaws been clamped together tightly as a scallop shell, exactly how much every article in the mansion cost.
The U-shaped tube was provided with a stopcock C, and two ground connections g and g1 one for a small bulb b, usually containing caustic potash, and the other for the receiver r, to be exhausted. The reservoir R1 was connected by means of a rubber tube to a slightly larger reservoir R2, each of the two reservoirs being provided with a stopcock C1 and C2, respectively.
If the burette has a glass stopcock, this should be removed after the cleaning and wiped, and also the inside of the ground joint. The surface of the stopcock should then be smeared with a thin coating of vaseline and replaced. It should be attached to the burette by means of a wire, or elastic band, to lessen the danger of breakage.
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