. American chemical journal . munication, and any lack of rigidityin the walls of the communicating channel gives rise to diffi-culties which are often very aggravating to the when manometers are to be compared with each otheror with a standard, and when the question of stretching isto be investigated, absolute rigidity in this part of the apparatusis indispensable. The earlier forms of apparatus used byus were all imperfect in that they did not permit effectivecomparisons at pressures above 2 atmospheres. The appa-ratus which was devised during the past year, however, en-able
. American chemical journal . munication, and any lack of rigidityin the walls of the communicating channel gives rise to diffi-culties which are often very aggravating to the when manometers are to be compared with each otheror with a standard, and when the question of stretching isto be investigated, absolute rigidity in this part of the apparatusis indispensable. The earlier forms of apparatus used byus were all imperfect in that they did not permit effectivecomparisons at pressures above 2 atmospheres. The appa-ratus which was devised during the past year, however, en-ables us to carry the investigation of the manometers up topressures of 300 atmospheres. It is shown in section in FigureI. It consists of a rectangular steel block which has beenbored from end to end in the horizontal direction (a. Figure 328 Morse and Lovelace. i). Meeting the horizontal hole are two vertical holes, band c. The latter serve as receptacles for two manometerswhich are to be compared or tested, one of which may be. Manometers for the Measurement of Osmotic Pressure. 329 the standard manometer; or one may be occupied bya manometer and the other by a straight open tube,as in calibrating or in determining capillary depression,etc. At the ends of the block, the horizontal hole is boredout to a larger diameter and the wider parts are threadedto receive the steel plugs d and e, which hold the packing inplace. The packing plugs are in turn bored and threadedto receive the plungers / and g, by means of which the pressureis regulated. The two plungers differ only in respect to has nearly the diameter of the hole a, and serves forcoarse adjustments; while the other is small, and is employedto effect slight changes in pressure. Both are operated bylevers shown at h and i. The packing plugs in the verticalholes, d and e\ are bored but not threaded, and their lowerends are concave in form. The packing through which the plungers pass lies betweentwo steel disks, jj, both
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