Rudiments of Chemistry; With Illustrations of the Chemical Phenomena of Daily Life (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1836 Excerpt: ...fire by numerous openings, and the rest passes into the apartment along the floor; or, where this cannot so conveniently be done, it may be introduced above as at d, or at a little distance from the chimney. It is obvious, however, that it is not necessary that any of the air should pass directly from the air-chamber to the fire-place; if all of it be made to pass into the room, it must soon find its way into the fireplace, from the expansion produced there as the combustion proceeds. 224. Small portable furnaces, called Chauffers, are found very convenient in numerous operations where heat is required; they may be made from 3 to 6 or 8 inches in diameter, and 6, 8, Fig. 60. Fig. 61. Fig. 58. or 10 inches deep. A chimney put over them increases the heat, Fig. 58. Tubes are often heated with them in the manner shewn in Figs. 59. and CO. Occasionally small crucibles are perforated and used as chauffers. Fig. 6L. 225. Chauffers are usually filled with red-hot cinders or charcoal. Wood heated in a common fire till all flame ceases, gives excellent charcoal for this purpose. When the chauffer is very small, charcoal alone is employed. 22U. With 20 or 24 bricks, and a few small slips of narrow hoop iron, a chauffer or small furnace may be constructed in a few minutes, capable of giving a good red heat, where the usual facilities for operating are not to be obtained, and where a common fire is not accessible. Suppose the bricks to be 5 inches broad and 10 long, 3 are laid side by side as in Fig. 62, and 3 more in the same way, and opposite to the first, at the distance of 4 inches. The slips of iron are placed in the middle to support the fuel, and one or two courses of bricks laid above them, so as to leave art aperture 5 inches square. If the bricks be laid with...