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 . iciently numerous. Thetwo ends of the apparatus are termed its poles,and the zinc pole will be found to exhibit posi-tive, the copper extreme negative electricity. 403. The pile of Yolta is now very generally supersededby a more convenient and efficient apparatus ; in which themetals are arranged in the form of a trough ; it was the in-vention of Mr. Cruickshank, a
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 . iciently numerous. Thetwo ends of the apparatus are termed its poles,and the zinc pole will be found to exhibit posi-tive, the copper extreme negative electricity. 403. The pile of Yolta is now very generally supersededby a more convenient and efficient apparatus ; in which themetals are arranged in the form of a trough ; it was the in-vention of Mr. Cruickshank, and is represented by the fol-lowing cut: Double plates of copper andzinc soldered together, are ce-mented into wooden troughs inregular order, and the interve-ning cells are filled with someappropriate fluid, for the pur-pose of rendering the combination active. Such an appa-ratus, it will be perceived, affords an example of galvanicarrangement of the first kind, formed by two perfect andone imperfect conductor ;(396, 401) but it admits of being somodified as to furnish a battery of the second kind, viz. withone perfect and two imperfect conductors. In this case platesof one metal only are to be cemented in the grooves, antt. 304 IARISS MEDICAL CHEMISTRY. the cells are then filled, alternately, with two different former scheme of apparatus is, however, the oneuniversally preferred for all purposes of experiment. 404. As the use of the trough is attended with great incon-venience in filling and emptying it; and as the metals becomerapidly corroded without such a precaution is observed, theplates are now usually so constructed that they maybe imme-diately removed from the liquid, and as speedily restored to annexed sketch represents the most approved apparatusfor this purpose.
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Keywords: ., bookcentury1800, booksubjectchemistrypharmaceutica, bookyear1825
