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The liquid traverses the porous sides of this under the influence of atmospheric pressure, since we cause a vacuum around the tube by means of an air-pump.
He laid up no money from teaching, but like a true man of genius spent it upon books, a small air-pump, an electrical machine. By training his advanced pupils to manipulate these he 'extended the reputation' of his school. This was playing at science. Several years were yet to elapse before he should acquire fame as an original investigator.
Then he showed Richard how the cushion could be inflated in a few seconds with an air-pump; and how, being inflated, an automatic valve closed and kept the air prisoner. "A tidy arrangement, take my word, and does that Russian party credit!" "What will he do with it?" asked Richard.
He gave the glass cylinder of his electrical machine a turn or two, and was for the moment gratified to elicit a faint spark, a feeble snap of blue fire, which clicked from the "receiver" to his knuckles. His eye dwelt fondly for a few seconds on the air-pump, but wandered from that to the telescope, and finally took cognizance of an apparatus for weighing heavy articles.
He also subsequently invented the D slide valve, or at least greatly improved it, while he added to the power of the air-pump, and gave a new arrangement to the other parts, with a view to the simplification of the powers of the engine. To make the D valve work efficiently, it was found necessary to form two perfectly plane surfaces, to produce which he invented his planing machine.
They took away the main stanchions of the bridge for that work, and, crazy with toil, did not see till all was in place that the rounded bars of iron must be flattened from top to bottom to allow the air-pump levers to clear them. It was Wardrop's oversight, and he wept bitterly before the men as he gave the order to unbolt the struts and flatten them with hammer and the flame.
"Deep has been, and is, the significance of Miracles," thus quietly begins the Professor; "far deeper perhaps than we imagine. Meanwhile, the question of questions were: What specially is a Miracle? To that Dutch King of Siam, an icicle had been a miracle; whoso had carried with him an air-pump, and vial of vitriolic ether, might have worked a miracle.
In the condenser body. In the circulating-water inlet pipe close to the condenser. In the circulating-water outlet pipe close to the condenser. In the air-pump suction pipe close to the condenser. In the air-pump suction pipe close to the air pump.
When any substance was introduced into this arch, it instantly became ignited; platina melted as readily in it as wax in a common candle; quartz, the sapphire, magnesia, lime, all entered into fusion; fragments of diamond and points of charcoal and plumbago seemed to evaporate in it, even when the connection was made in the receiver of an air-pump; but there was no evidence of their having previously undergone fusion.
He was a strong, red-faced individual, but his face turned to a kind of ghastly pallor. It was all so quick that Phil had no time to speak from her boat. Philip Holt, who was in the same boat with the man, grasped the situation as quickly as Phyllis did. With a single motion he took the tender's place at the air-pump. Phil saw that he was pumping away with vigor.
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