. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. REY CONCENTRATOR. 339 Within the main frame a light shaking frame (f) is supported, onwhich the belt is carried. This frama (f) consists of itwo sides of woodwith cross braces and bolts, and carries at each end a set of bearings inwhich the end rollers (a a^) revolve. Between these end rollers a numberof small galvanised ironrollers (d d) are carried inbearings on the shakingframe, and with the endrollers form an inclinedplane on which the upperor working surface of thebelt (e)
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. REY CONCENTRATOR. 339 Within the main frame a light shaking frame (f) is supported, onwhich the belt is carried. This frama (f) consists of itwo sides of woodwith cross braces and bolts, and carries at each end a set of bearings inwhich the end rollers (a a^) revolve. Between these end rollers a numberof small galvanised ironrollers (d d) are carried inbearings on the shakingframe, and with the endrollers form an inclinedplane on which the upperor working surface of thebelt (e) is supported. Thebelt (e) is made of rubberwith canvas filling, has softflexible rubber flangesaround its edges to preventthe overflow of water fromits surface, is 27^ ft. inlength and 4 ft. in belt is a special articleof manufacture, which hastaken several years to per-fect. Any defects in itsconstruction or impurity inmaterial used involves arapid wear of the belt, andthe cost of renewal is has shown thatperfect belts will last withconstant service from threeto six years if properly. cared for. The shaking frame is supported on six legs or toggles (n n) which stand in adjustable stirrups {b b) hanging on the main frame, and which are used sometimes for slight changes in inclination of frame or levelling of the belt across. The shaking frame (f) is connected by short connecting rods (r r) attached to the lower roller bearings, to two eccentrics having about | in. motion, and fixed on driving shaft (h). This driving shaft is fitted with tight and loose pulleys (i) which can be driven by a 3-in. belt from broad-faced pulley on any convenient 340 MACHINERY FOR METALLIFEROUS MINES. shaft in the mill, or from a special countershaft put up above themachine. There are two small flywheels (q q) on the driving shaft, and also a cone pulley (j^), whichis connected by narrow leatherbelt to a corresponding conepulley (j) on the shaft speed of this low
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