Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 436
Silver — Extraction. 414 a cylinder of tin plate c ; d are water- receiving the rota;-y motion, and in the eentre with a 5-in. plug-hole 6 by tauks supplied by pumps through means of pipes e ; below each barrel/, which Fig. 160. … and the consistence of the mass is ad- which it is charged and emptied. The justed by adding a little water or ore arrangement of the barrels, feeding- as may be necessary ; this done, 5 cwt. hoppers, escape-troughs, and motive mercury is introduced, and the barrel is power is better illustrated in…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
