Archive image from page 907 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 A.—a, mouth of the combustion-tube ; b, three- legged brass tube furnished with the stop-cock (c); d, d, caoutchouc connectors; e, glass tube, upwards of 30 inches long, recurved at the lower extremity for delivering gas in the mercurial trough. B.—Bulb-tube for containing hydrochloric acid in the determination of nitrogen by the method of Varrentrapp and Will. C.—a, mouth of the combustion-tube; 6, caoutchouc connector ; c, gas delivering tube. ammonia is col
Archive image from page 907 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 A.—a, mouth of the combustion-tube ; b, three- legged brass tube furnished with the stop-cock (c); d, d, caoutchouc connectors; e, glass tube, upwards of 30 inches long, recurved at the lower extremity for delivering gas in the mercurial trough. B.—Bulb-tube for containing hydrochloric acid in the determination of nitrogen by the method of Varrentrapp and Will. C.—a, mouth of the combustion-tube; 6, caoutchouc connector ; c, gas delivering tube. ammonia is collected by attaching a bulb-tube of the form represented (jig. 431, B), air-tight with a good cork, to the retort-tube, the apparatus having been previously charged with hydro- chloric acid sp. gr. , as high as the lines in the figures indicate. Pure hydrochloric acid is easily procured for this purpose by diluting the ordinary acid of the shops till it has a sp. gr. of , and distilling in glass ves- sels—the first eighth may be rejected. Dis- tillation may be proceeded with until three- quarters of the acid employed have passed over. It is better for the operator always to rectify his own acid, in order to be quite sure of the absence of any trace of am- monia. The tube connecting the bulbs should be somewhat larger in diameter than that of the ordinary potash apparatus, in order to allow the liquid to be poured out readily. When the operation is complete, absorption will take place and the fluid rise in the bulb nearest the fire; at this moment we nip off the top of the combustion-tube and draw air carefully through the apparatus in the usual way. When the combustion is terminated, the contents of the bulb-tube are emptied into a small evaporating dish, and the apparatus washed out first with a little alcohol and ether, and afterwards several times with water; some solution of bichloride of platinum is added, and the whole evaporated to dryness by a water-bath
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