This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1841 edition. Excerpt: ...by means of galvanism. In 1833, I made use of the following contrivance. I acidulated the suspected fluid with diluted sulphuric acid, and introduced into it a slip of zinc, round one end of which was some gold leaf a galvanic action commences, and after some hours, metallic arsenic is deposited on the ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1841 edition. Excerpt: ...by means of galvanism. In 1833, I made use of the following contrivance. I acidulated the suspected fluid with diluted sulphuric acid, and introduced into it a slip of zinc, round one end of which was some gold leaf a galvanic action commences, and after some hours, metallic arsenic is deposited on the metals as a dark stain; on drying the metals, and introducing them into a tube, the application of heat affords the alliaceous odour. In Marsh's elegant apparatus, arseniuretted hydrogen is formed: the suspected liquid is introduced into a syphon-tube, one end of which is shut by a stop-cock with a capillary bore. The fluid is acidulated with sulphuric acid, and a piece of pure zinc is introduced before the stop-cock is fixed to the short leg of the syphon; the nascent hydrogen decomposes the salt of-arsenic in the liquid, unites with the metal to form arseniuretted hydrogen, which gradually fills the short limb of the syphon; on opening the cock, this gas is fired, and over its flame is suspended a piece of porcelain, on which a black crust of arsenic condenses, with a strong odour of garlic. Antimonial salts thus treated, give a similar crust, but without this smell; the crust of antimony is not so easily raised as arsenic in white vapour, and does not again condense in a crystalline form. It is necessary, however, that the materials and apparatus be absolutely free from arsenic, except what may be in the suspected liquid. I also find that, after using the apparatus several times with arsenical solutions, so much arsenic is deposited on the inside of the stop-cock, that it will afford indications of that metal with distilled water, pure acid, and pure zinc, for more than twenty trials. I found it absolutely necessary, therefore, to...
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Add this copy of Outlines of a Course of Lectures on Medical to cart. £25.98, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2010 by Gale, Making of Modern Law.
Add this copy of Outlines of a Course of Lectures on Medical to cart. £45.80, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Gale, Making of Modern Law.
Add this copy of Outlines of a Course of Lectures on Medical to cart. £54.24, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2016 by Wentworth Press.
