Transactions of the American Ceramic Society containing the papers and discussions of the annual meeting Volume 11 - Tapa blanda

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. 1909 Excerpt: ...any mechanical changes. I have devoted considerable time to this question, as it is a subject of great moment to the window glass manufacturers, particularly those using the sheet or cylinder drawing machine. 1 discovered this peculiar condition while acting as Chief Engineer of the American Window Glass Company's experimental department, during a search for the cause of the enormous breakage which occurred at that time, and there appears to be no doubt as to the fact that the salt cake was responsible, not only for many of the cords, strings, etc., but was also accountable for much of the breakage taking place during the early days of machine operation, but I believe, and strongly advocated at the time, that a great percentage of this was due, not to the salt cake being present, but to a poor or improperly melted metal. Subsequent experiments and practice have, in a measure, confirmed this, but I must confess that just what was the cause, and where to find a reasonable explanation of this peculiar phenomena from a scientific standpoint, I am as yet unable to answer with certaintv. CLARIFIERS, DECOLORIZERS, ETC. Regarding these materials, there is not much of importance to say from a physical standpoint, other than color. Arsenic, which is used as a elarifler, does increase the crushing strength somewhat, but it is seldom found in the finished metal in sufficient quantity to be noticeable, and the same is true of manganese. Cryolite, which is used sometimes as a elarifler, is of but little value, and is somewhat detrimental to the furnace or pots, owing to the liberation of fluorine. It would be of some value, could it be used in sufficient quantities to introduce enough alumina to be of importance, but this cannot be done without producing stones, or opal ...