. American chemical journal . sed potassium hydroxide, and resublimed phosphoruspentoxide. The glass tubes containing the dry reagentsare all connected with each other and with the receptaclefor the nitrogen by fusing the ends together. We have had occasion to answer many inquiries regard-ing our method of filling and closing manometers, whichsuggests that a somewhat detailed account of the proceduremay be of use to others who are engaged in work with theseinstruments. The arrangement of apparatus which is employed for thepurpose is shown in Fig. 4. A is the reservoir for nitrogen;B is the cal
. American chemical journal . sed potassium hydroxide, and resublimed phosphoruspentoxide. The glass tubes containing the dry reagentsare all connected with each other and with the receptaclefor the nitrogen by fusing the ends together. We have had occasion to answer many inquiries regard-ing our method of filling and closing manometers, whichsuggests that a somewhat detailed account of the proceduremay be of use to others who are engaged in work with theseinstruments. The arrangement of apparatus which is employed for thepurpose is shown in Fig. 4. A is the reservoir for nitrogen;B is the calibrated manometer which is to be filled and closed ;and C is an arrangement for filling and emptying the manom-eter. B is joined to .4, at d, by fusing together the endsof the glass tubes and to C, at e, by means of rubber mercury in C is separated from that in the manometer 334 Morse and Lovelace by the air which nearly fills the wide tube below e. In thisway, the mercury in C, which may be impure from its contact. FfG^ with rubber tubing, is prevented from ever entering the manom-eter and contaminating the very pure mercury with which Manometers for the Measurement of Osmotic Pressure. 335 that instrument is filled. This air also plays an importantr61e when the manometer is closed. Before joining the manometer B to A and C, its lower endis immersed in pure mercury and, with the instrument in aninclined position, gentle suction is applied at the other enduntil the two bulbs are filled with mercury. The introduc-tion of the mercury in such a manner that the column betweenthe two bulbs remains unbroken is an operation of some diffi-culty at first, but it is readily accomplished after a little prac-tice. It is hardly necessary to state that the mercury whichis used in manometers should never be allowed to come incontact with rubber. The side tube / is closed with a short piece of rubber tub-ing and a screw pinchcock, and is connected with a dryingapparatus. When the ma
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