The Quartz Operator's Hand Book (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. 1871. Excerpt: ... QUAETZ MACHINEET. For the mechanical reduction and concentration of ores, two kinds of quartz machinery, the wet and the dry, are in use. The application of the former obtains in nearly or quite all extensive works, while that of the latter is mostly limited to the test-room and experimental operations. For the full treatment of ores, auxiliary machines, common to the two, are employed. Of these the RockBreaker, Amalgamator and Separator may be mentioned. The most efficient and economical quartz machinery thus far introduced for the mechanical reduction and concentration of ores and rock containing the precious metals, and for the purposes of amalgamation and subsequent treatment, consists, aside from prime movers, common connections and tanks, chiefly of the Rock-Breaker, Straight Batteries, Grinders and Amalgamators, Separators, Concentrators, Retorts, Crucibles, and Ingot Molds. ROCK BREAKERS. Rock Breakers are machines chiefly employed for the crushing of rock, as it comes disengaged from the mine, quarry or other bed, to fragments an inch, half inch or so in diameter. For this work they are fast superseding the " Cornish Rollers" and " Heavy Stamp "--in fine, all other machinery designed for like purposes. They have also been employed for the pulverization of ores and rock, but have not been sufficiently successful to warrant their use in this department. The nearly upright jaws with convergent crushing faces constitute one of the chief features of Rock Breakers. These are caused by means of machinery crank, or its equivalent, directly or indirectly applied, alternately to recede from.and approach each other. In some machines one, and in others both jaws are movable; and in some cases they have, additional to the vibratory, a lateral or vertical grin...