Bulletin . salt is produced. The particles of solid saltprobably afford centers of crystallization in the saturated brine. The product is not simply a mixture of crystals of various texturebut is uniform and peculiar in texture. The identity of the fine saltfrom the vacuum pans usually is quite lost and the product approachesin its physical character the salt made by the open-pan or the grainerprocess. The character of the combination salt may be altered byvarying the proportions of vacuum-pan and of grainer salt, and manydifferent grades of salt may also be made by varying conditions in thegr
Bulletin . salt is produced. The particles of solid saltprobably afford centers of crystallization in the saturated brine. The product is not simply a mixture of crystals of various texturebut is uniform and peculiar in texture. The identity of the fine saltfrom the vacuum pans usually is quite lost and the product approachesin its physical character the salt made by the open-pan or the grainerprocess. The character of the combination salt may be altered byvarying the proportions of vacuum-pan and of grainer salt, and manydifferent grades of salt may also be made by varying conditions in thegrainers. COMMERCIAL STATUS OF PROCESSES. The wear and tear incident to the operation of all salt-makingmachinery is heavy. Moreover, if a salt block is allowed to lie idlefor a year it becomes almost ruined; consequently, it is often cheaperto make salt for a season without any profit than to shut down. a Lillie, S. M., U. S. Patent No. 988002, dated Mar. 28, 1911. BUREAU OF MINES EULLETIN 146 PLATE >XII. E F MARKET SIZES OF SALT. MAGNIFIED 18 DIAMETERS. A, Salt made in a triple-effect Manistee vacuum pan by the Hutchinson Salt Co., Hutchinson, Kans.; B,Salt made by the Alberger grainer process, Diamond Crystal Salt Co., St. Clair, Mich.; C, Salt made in theLillie quadruple-effect evaporator, San Francisco Salt Refinery Co., San Francisco, Cal.; D, Salt made in asingle-effect vacuum pan, Worcester Salt Co., Silver Springs, N. Y.; E, Salt made in Lillie evaporating appa-ratus, Carey Salt Co., Hutchinson, Kans.; 1\ Salt made in a quadruple-effect vacuum pan, California Salt Co.,San Francisco, Cal. BUREAU OF MINES BULLETIN 146 PLATE XXIII
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