Bulletin . expensive in the long run and obviates the difficulty of pro-curing laborers to work in the hot steam-laden atmosphere of thegrainer room. Various types of salt raker have been developed,their object being to collect the salt and deliver it to the incline or apron at the end of the grainer. In whatever manner constructed,mechanical rakers must be capable of keeping clean a floor 100 to 150feet long and 12 feet wide, and they must deliver the salt to the in-cline at such rate as will allow it to drain properly before beingpushed into the mechanical conveyors for delivery to the wareh
Bulletin . expensive in the long run and obviates the difficulty of pro-curing laborers to work in the hot steam-laden atmosphere of thegrainer room. Various types of salt raker have been developed,their object being to collect the salt and deliver it to the incline or apron at the end of the grainer. In whatever manner constructed,mechanical rakers must be capable of keeping clean a floor 100 to 150feet long and 12 feet wide, and they must deliver the salt to the in-cline at such rate as will allow it to drain properly before beingpushed into the mechanical conveyors for delivery to the warehouse. Iron or steel rakers are usually used, but these metals are stronglyattacked and rapidly deteriorate in a salt-laden atmosphere. More-over, the iron salts formed by their destruction discolor and therebycheapen the product. Chains formerly used in the construction of aWillcox, G. B., Salt manufacture: Trans. Am. Soc. Mech. Engr., vol. 30,1909, pp. 1065-1085. BUREAU OF MINI BULLETIN 146 PLATE XII Valve. 6h J
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
