The Chemistry of the Arts (V. 1)
by Samuel Frederick Gray (9780217751124)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ternis during the time of cooling, alternating with their expansion when they are again put into use, wear them out very rapidly. When this continual use of the furnaces cannot be adopted, some chemists, in order to make them last longer, bind them with iron bars, either screwed together, or fastened by loops and wedges; others, taking advantage of the cheapness of cast-iron in England, enclose them in cases of that metal, cast for the purpose, with proper openings; the several parts of which case are screwed 01 pinned together. For common furnaces, thin flat bars of tough iron, about eight inches longer than that part of the furnace where they are to be inserted, slit for four inches at each extremity, and the ends turned up, are built in each alternate course round the fire-room and chamber; by which means the expansion of the furnace. is attempted to be checked, and its retraction secured. The usual method of bricklayers building in pieces of small hoop-iron between the courses of brick is a ridiculous absurdity. Nor should a chemist allow them to plaster over his furnace, or surround their edges with cloth, or sheets of lead. If there be fear of the edges getting chipped by pails or other vessels, let them be surrounded with an iron hoop, or if this should be prejudicial to the materials which may be at times dragged over them, then the edges may be made of a wooden curb, fastened together with tree.nails. FURNACES FOR CHEMICAL OPERATIONS IN GENERAL. The Stove-Holes. The stove-holes, as they are usually called, are the most use- ful of all furnaces; and, although this is so generally known that they are not only to be found in all druggist's laboratories, but also in all well-furnished kitchens, where they are used for the nicer operations of household econom...

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