The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . d into 100 equal parts, others into tenths and hundredths of acubic inch. For this purpose, also, graduated tubes, sufficiently small toallow their mouths to be closed with the thumb, will be found extremely•onvenient. Where large quantities of gases are required to be collected and pre-Served, we employ Gas-holders and Gazometers. The most useful instru-ment of th
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . d into 100 equal parts, others into tenths and hundredths of acubic inch. For this purpose, also, graduated tubes, sufficiently small toallow their mouths to be closed with the thumb, will be found extremely•onvenient. Where large quantities of gases are required to be collected and pre-Served, we employ Gas-holders and Gazometers. The most useful instru-ment of this description is that inventedby Mr. Pepys, and known by the name ofthe Improved Gas-holder, which is madeeither of japanned iron or copper. Itconsists of a body or reservoir A, hold-ing from six to eight gallons ; a cisternB, from which issue two tubes suppliedwith stop-cocks, e, f, one entering the re-servoir, the other continued, as shown bythe dotted lines, to near the bottom. Cis a short oblique tube, issuing from thebottom of the reservoir, and capable ofbeing accurately closed by a screw. Dis a glass communicating at both endswith the body of the gas-holder. F is a 3I1- ^ funnel, communicating with the tube/, &. v and which may be used or not, accord-ing to circumstances, its object merelybeing to increase the force of the waterby the height of its column. When it isintended to fill this apparatus with gas,the first step is to fill it with water, whichmay be effected in the following the tube C, and open the stoju•; Pt-/, water is then poured into hV PARIS S MEDICAL, L,HEMi6iKV. 225 the small furnace D, and terminates in the spiral pew-ter tube d, d, immersed in water. A given weightof pure iron wire, coiled up, is introduced into the tubeC, and the whole made red hot; the water in B is thenmade to boil, and the vapour, on coming in contact withthe red hot iron, is in part decomposed, the oxygen beingretained by the iron, and the hydrogen escaping
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Keywords: ., bookcentury1800, booksubjectchemistrypharmaceutica, bookyear1825
