ISBN: 9781130448610

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 84 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purc… Mehr…

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 84 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.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. 1904 edition. Excerpt: . . . as nearly as possible to the working conditions, and which could be controlled so as to give uniform conditions, the following method was employed. A small rectangular brick furnace was built that was t1 inches high, 8y2 inches deep, and six inches wide in the clear. The side walls were four inches thick, and 14-inch thick asbestos boarding was used for the front and back walls. The specimen was set across the top of this furnace, leaving a 1x6 inch slot each side for the escape of the gases. The underside of the specimen was heated to a bright red heat by a special Bunsen gas burner placed in the furnace, and the temperature of the top or opposite side was taken every ten minutes with high grade thermometer (Green), the bulb of which was covered with steel filings, to ensure a good contact. The entire top of the specimen, including the thermometer, was covered with eight thicknesses of heavy asbestos cloth, which aggregated iy2 inches in thickness, to prevent radiation. A double shield of white asbestos board was set on the stem of the burner, to reflect the heat back onto the specimen, and the furnace was kept continuously hot. With these conditions duplicates checked satisfactorily. The temperature was read every ten minutes from the time the specimen was set on top of the furnace until it had nearly attained its maximum temperature. Starting with atmospheric temperature or 74 to 82 degrees F. , it was found that the increase in heat shown by the thermometer, or the rate of transmission through the specimen, with the underside at a bright red heat (or about 1400 degrees P. ), was very slow for the first ten minutes, in fact. no increase with the Z series. It was less slow for the next ten to fifteen minutes, and after twenty. . . This item ships from La Vergne,TN., RareBooksClub<