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
General Books LLC
|Country of origin:
P. M. Randall
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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