Transactions of the American Ceramic Society Containing the Papers and Discussions of the Annual Meeting Volume 4 (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. 1902 Excerpt: ...was drawn for the purpose of showing what took place during the soaking period at 725 degrees. The solid black line shows the time-loss curve of the kaolin brickettes. It will be observed that the bulk of the water was driven off in less than two hours, or between five and seven hours after lighting the kiln; and it will also be observed that the soaking period had very little effect on the brickettes. From 8 hours and 55 minutes to 28 hours the curve line is almost straight with a total loss of 1.74 percent during the period. With the kaolin-lime brickettes it is quite different. It will be observed (broken line) that the loss continued at a fairly rapid rate during the whole of the burn, and that during the soaking period, 11 hours and 30 minutes to 24 hours, there was a loss in weight of 4.1 percent. The following tables show my observations as recorded: Soaking period of 12 hours duration, during which no gain of temperature occurred. DISCUSSION. Mr. IV. P. Gates: I have had some experiences in this line myself in our kilns. I used a natural limey clay, and I started drawing my trials much earlier. All were dried at 120 C. and placed in the kilns. On drawing up to about 150 C, the trials showed a decided gain in moisture, the highest amounting to four or five per cent. This gives a pretty good indication that a good deal of fuel could be lost from overdrying the wares. I think many plants dry their ware too much, whereas they could save by underdrying, and letting some of the moisture be taken off in the kiln, as the test showed that it had to be done over again in the kiln in any case. Mr. Alfred Yates: My experience teaches me that you cannot get the ware" dry enough; the dryer you set it, the better results you get. The Chair: We all know that t...