Stock Photo: Carpenters constructing a stamping mill for breaking up ores and extraction of metals. Men on the left are measuring up a baulk of timber, K, to form a cam-shaft. A completed cam-shaft at H fitted with cams I. B is the stem of a single stamp, A. All the pieces of the mechanism are made of wood. F

Stock Photo: 1746-1915 Carpenters constructing a stamping mill for breaking up ores and extraction of metals.  Men on the left are measuring up a baulk of timber, K, to form a cam-shaft.  A completed cam-shaft at H fitted with cams I. B is the stem of a single stamp, A.  All the pieces of the mechanism are made of wood. F