Identifier: philtrans01796610 (find matches)
Title: Physico-Chemical Determinations at High Pressures by Optical Methods
Year: 1913 (1910s)
Authors: Wahl, W.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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cal installation for observation and for optical measurements. These may conveniently be described apart. 1, The High-pressure Plant., The apparatus for producing the pressures consists of two screw-compressors—-onefor pressures up to 6,000 atmospheres, and one for pressures not exceeding 600 AT HIGH PEESSUEES BY OPTICAL METHODS. 121 atmospheres—a small hand-compressing pump for filling the larger compressor withoil at pressures of about 800 atmospheres, a steel vessel, to which both compressorsand the pressure-bomb holding the substance are connected by means of drawn-steelcapillary tubes of 7 mm. outer diameter and 1 mm. bore, and a high-pressure valve, bywhich the smaller compressor, together with its manometers, can be shut off from therest of the apparatus when working at pressures above 600 atmospheres. The wholeof this apparatus is fixed to a heavy oak bench. The various parts are connected asshown by the diagram (fig. l), thus forming a pressure-plant which may be used for
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fnr~\ B C Fig. 1. any kind of high-pressure work. The large compressor for high pressures (A, fig. l)is of the Cailletet type, but made entirely of steel, and is of much larger sizethan the ordinary Cailletet apparatus. It is very similar to those used by Tammannin his high-pressure experiments.# As in the case of the Cailletet apparatus, aplunger is forced into a cylindrical compressing chamber in the central steel block A bya powerful screwing gear. Oil is pumped into this compressing chamber by means ofthe compressing pump B, which is connected to the oil reservoir C. D is a valve bywhich the compressing chamber is shut off from the pump B before the compressor isworked. By the valve E a fine capillary channel, which connects the compressionchamber with the high-pressure manometer F and with the pressure-transmittingpipe G, can be shut off from these, thus leaving only the manometer connected withthe pressure-transmitting pipe and the pressure-bomb, in which the investigation is *philtrans01796610

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