Rifle for Rifle for mining model (scale 1.4)

Rifle for mining model (scale 1.4)

This riffle was patented in 1881 by Mr. W. H. Howland, to take the place of the ordinary riffle bars in the flume or sluice carrying auriferous material or sulphides from a mill. It is made of case iron in sections, each consisting of an anticlinal ridge with grooves on both slopes parallel to the direction of the current. At the ridge and also at the foot of the tail slope are throughs to hold the mercury. The sections are placed, breaking joint, in the flume to produce eddies which assist the separation of the particles of gold and their collection by the mercury.