. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . 3301.« A ^ ^B 1^ P^rtl . la A L i. The gold from the various machines, mixed with some sand and other impurities, is carried tothe Chilian mill for amalgamation, in case there is no other machine for doing that work. This isan imperfect machine for amalgamation, and causes losses in quicksilver and gold. In most casesseparate machines are used for amalgamation ; in North Carolina the cradle is generally cradle is made from the trunk of a tree,
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . 3301.« A ^ ^B 1^ P^rtl . la A L i. The gold from the various machines, mixed with some sand and other impurities, is carried tothe Chilian mill for amalgamation, in case there is no other machine for doing that work. This isan imperfect machine for amalgamation, and causes losses in quicksilver and gold. In most casesseparate machines are used for amalgamation ; in North Carolina the cradle is generally cradle is made from the trunk of a tree, hollowed out so as to form a round trough, closed at oneend and open at the other, as represented in Fig. 3302. Here is a battery of five cradles represented ; as many as that are frequently connected andmoved by a little boy. A cradle is from 10 to 12 ft. long, hollowed out of a trunk of at least 24 The bottom part is thicker than the sides. The fii-st cradle in the drawing shows asection. We see here three or more grooves carved in the bottom; in each of tliese grooves from3 to 4 lbs. of quicksilver are put. At the farthest end sand is shovelled in and
Size: 2372px × 1053px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
