Platers' Guide Volume 1 (Paperback)

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. 1905 edition. Excerpt: ...color, in the crown of an openhearth furnace. Each variety of brick has its peculiar uses. _ And so it is with the pottery to withstand the action of chemicals. Common pottery as seen in household utensils is far from what is desired for chemical purposes. The clay is not the proper vanety and acids may soot attack the surface and cause the whole to scale. Vi/'e have seen common pottery disintegrate within a short period when used for holding strong acid dips. i Platers should know that a particular grade of pottery is used by manufacturers of chemicals andthey would not think of usfng the common grade of such ware. This ware is now made. in such a variety of shapes that any special apparatus may easily be obtained. II is unnecessary to use the ordinary round stone crock when airother shape may be what i.'J desired. _ For such corrosive solutions as the hot, matt dip or any other similar liquids chemical pottery will be found particularly serviceable, and is gradually coming into use among platers as it has among the chemical manufacturers. ly believe that it was so until I had proved it beyond any possible doubt. It is not always, to be sure, that the lining brings about the difiiculty; but those who carefully peruse this article will quickly appreciate how, under certain condiuions, the numerous blowholes in a large casting may come from the ladle from which the metal is poured. When a casting beyond the capacity of the crucible in which the metal is melted is to be made. it is necessary to use one of two methods for pouring the casting. If the casting is not too large, several pots of metal may be poured at once; but this is open to the objection that a cleaner casting results when only one gate is used. If, however, a large...