A treatise on chemistry. Vol. III, The chemistry of the hydrocarbons and their derivatives, or, Organic chemistry. Part I / by H.E. Roscoe & C. Schorlemmer.

  • Henry Enfield Roscoe
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on chemistry. Vol. III, The chemistry of the hydrocarbons and their derivatives, or, Organic chemistry. Part I / by H.E. Roscoe & C. Schorlemmer. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    to that obtiiiued from red-hot chai'coal, is produced by the igni- tion of heated fireclay cylinders. The hollow cylinders are fixed upon fish-tail gas-burners, and are closed at the top, the sides being punctured ■with a large number of small openings, at Fig. 17. which the gas burns mixed with air. In order to concentrate the heat, plates of fireclay are placed at the sides and top of the furnace. Another form of combustion-furnace now much in vowue is that proposed by Glaser ^ and shown in Fig. 19. It was first described by Donny, and the combustion-tube is heated by means of perforated pieces of iron shown in the figure, forming a trough in which the combustion-tube lies wound round with iron gauze. The tube is heated partly by conduction from the hot iron and partly by the gas which burns through the perfora- tions. Perforated clay covers are employed for raising and equalising the temperature. 45 Combustion in a Current of Oxygen. When the combustion is performed according to Liebig's original method, it sometimes happens, especially in the case of bodies rich in carbon, that some of the carbon is deposited on the upper pnrt of the tube or even upon the reduced metallic copper, and this is only in- completely burnt when air is passed over it. In order t(.) avoid ' Ann. (Jliem. I'liarm. Ktipp]. vii. 213. Fig. 18.