. Physico-Chemical Determinations at High Pressures by Optical Methods . Fig. 2. current was then electro-magnetic. The liquid in the bath was well stirred by a smallturbine stirrer driven by an ordinary hot-air engine. Temperatures were measured by thermometers, divided into tenths of a degree,which have been compared with similarly graduated thermometers standardized atthe Physikalisch-Technische Reichsanstalt in Charlottenburg. 3. The Optical Installation. (1) The Optical Bench.—The optical observations are made by means of an opticalbench, each end of which is fitted with a screw-adjusting
. Physico-Chemical Determinations at High Pressures by Optical Methods . Fig. 2. current was then electro-magnetic. The liquid in the bath was well stirred by a smallturbine stirrer driven by an ordinary hot-air engine. Temperatures were measured by thermometers, divided into tenths of a degree,which have been compared with similarly graduated thermometers standardized atthe Physikalisch-Technische Reichsanstalt in Charlottenburg. 3. The Optical Installation. (1) The Optical Bench.—The optical observations are made by means of an opticalbench, each end of which is fitted with a screw-adjusting gear, the whole resting on AT HIGH PRESSUKES BY OPTICAL METHODS. 125 the iron plate to which the water-jacket and pressure-bomb are attached. With theaid of an autocollimation Gauss eye-piece, the whole optical bench can, by means ofthe screw-adjusting gear, be brought exactly into such a position that its optical axisis at right angles to the surface of the window in the pressure-bomb, or any polishedsurface inside of this. The adjusting gear for the optical bench
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