The Clifton clarion., 1889-08-14

First, the inclination of the table is always the same; second, the supply of Water requires no readjustment :; third. the position of the jets and of the brushes (when used) require no at
 tenticn after the first setting: and fourth, the different classes of con- centrateS. middlings and sand. being removed automatically, all hand labor is done. away with and the capacity of the machine over the stationary is increased from ten to fifty per cent, i according to the ore under treatment. In both of these buddles the speed is revolution per minute. Of course, in the first instance the distributor tray els at that rate, and in the latter case it is the table which travels.
 It is not intended in these papers to describe all and sundry the num- erous machines designed and built for the separation of fines, and in bringing my letters to close l will confine myself to description of two of the most advanced of the various types The first, and for many pur- poses the best, is the " Frue Yanner.r This machine consists of an endless rubber belt about four feet wide and about 30 feet long set in a frame, and { passing over rollers which form part of this frame. By the use. of suita- ble mechanism the belt is made to | travel around the rollers and in the direction of it's length, while at the same time the frame which carries ! the belt and rollers is caused to vii brate from side to side. The effect of this compound motion is to give a side shake and an intermittent for ward travel to the belt. In this ma chine the belt must be set perfectly level across it's face, but, as the upper and forward going side of the belt takes the place of the inclined table in the puddle. so the frame which car rics the rollers and belt is made ad- unstable, and according as the ore is light or heavy so can the frame be raised or lowered at the tail end to decrease or increase the inclination of the belt. Tbese belts are made with fange about one inch high on each side, to prevent the pulp from flow ing of the edges, and resemble a wide sluice with shallow sides. The ore is fed continuously to the belt by means of distributor which extends clear across the belt. The forward motion and side stroke of the belt partially separates the ore from the sands After the belt has travelled about 8 inches forward from the distributor, the ore which has settled on the belt is met by series of clear water jets which complete the washing, driving the sands back and down the incline toward the tail end, at which point the sands leave the machine. The concentrates, being heavier. sGe car ricd forward and past the jets, and by the onward motion of the belt are passed under the machine through a box containing water, and are there collected ready for drying an1 fur ther treatment. The capacity of these machines is from five to seven tons in 24 hours.
 The other machine which I have chosen as type is called the Hooper Sinner" It differs from the vanner in that it has no belt and has no side shake. The machine consists of two endless chains carrying troughs of seIni-circular form, closed at the upper and open at the lower end. These troughs are about four inches wide, two and one-half inches deep and four feet long. They are suitably fastened across the two chains and are carried forward in such manner that the discharge ends of the troughs are always presented to the side of the machine. The troughs are corrugated about one-third of their length from the closed end, and as the chain on which they are carried moves forward it passes over guides which are so ar ranged that at a certain point all the sand is discharged from the trough and nothing is left but concentrates and seconds. Upon reaching the end of is forward travel, the chain passes over suitable rollers and tic concen- trates and seconds are exposed to jets of water, which wash the contents into the proper receptacles. This machine has only two motions, q con-