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- W2086560046 abstract "Professor Rood's paper gave an account of his experiments with the pump for the purpose of obtaining the highest possible vacua. He first experimented with an arrangement similar to the ordinary form of the Sprengel pump, and reduced the pressure to one three-millionth. The exhaustion went on very rapidly at first and then very slowly-slower than the increased rarefaction seemed to call for. This indicated a leakage, and it was found that this leakage amounted in one minute to oneeighty-seven rnillionth of an atmosphere. The form of the pump was modified to correct the leakage, and a vacuum was obtained with a pressure of one-sixtyii.iilionth. It was impossible to get beyond that point, and it occurred to Professor Rood that the potash he used might have given out moisture. He therefore substituted sodium, and the pressure rose only to one-fourmillionth. Anhydrous phosphoric acid was substituted for the sodium, and the pressure fell to one-millionth. It finally struck the experimenter that the trouble was in the gauge, and when a correction was applied to the gauge, vacua were obtained with pressures of one ninety tour-millionth and one hundred and ten millionth. Higher vacua even can be obtained. It had recently been stated in Natlure, said Professor Rood, that his airangeinent was exhibited four years ago at the Kensington Garden, and he would not, therefore, call it new. But the best result obtained in England was one-twenty-millionth, and the best result reached by an eminent French chemist was one-seventeen-millionth. He, theretore, thought there must be at least something new in his method of using the Sprengel air-pump." @default.
- W2086560046 created "2016-06-24" @default.
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- W2086560046 date "1880-12-11" @default.
- W2086560046 modified "2023-10-14" @default.
- W2086560046 title "AN IMPROVED METHOD OF OPERATING THE SPRENGEL AIR-PUMP" @default.
- W2086560046 doi "https://doi.org/10.1126/science.os-1.25.291" @default.
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