The Pc rsons-Rittinger Table is a modification of the old Rittinger side-bump machine. The tables, as used at Bonne Terre, Mo., are built in pairs, and each table is made double, as usual, each half of the double table being about 3 x ft. instead of being hung from rods. the table is supported on four cast-iron feet or guides. which slide on horizontal steel rods. The latter rest in east-iron saddles, bolted to heavy sill timbers, which run under a whole row of tables. The tables bump against each other, the blow being taken by a joist of hard wood lying loose between them. The tables are forced apart. against the tension of springs, by a spiral. wedge-shaped cam. The number of bumps given per minute is 150 ; throw, in. The tables are inclined at an angle of 4Z'. Their surfaces are covered with black enameled duck, such as is used for desks, which furnishes a covering cheap and easily renewed, and well adapted for the fine material treated at Bonne Terre.
The Evans Thble is a circular huddle of improved pattern, which is in general use at the Lake Superior dressing works. Referring to Fig. 8, A is a launder to conduct the slimes from the catch-pit or slime box to the distributor, B, which has a partition (a) in it to sepa rate the clear water from the puddled water or slime water. The clear water is supplied by pipe (d) to the distributor, and runs over one-half of the table, D, while the slime water runs over the other half, being controlled by the division piece. L. The sand and water being on one side of distributor, B, runs through its perforated bottom, and are distributed equally over one-half of the stationary head. C. and run on the rotating table, D. into the circular launder, then through the waste pipes, 0 0 the ores remain on the upper part of table. 1), and after concentration being shielded from the action of clean• water by the cone-shaped head, C. The proper grades of ores are, through the action of clear water, washed about half way down the rotating table, D. They then come in contact with the diagonal perforated pipe. E, and are re-washed by a succession of small jets from perforations of small pipe. The ore passing between the jets is carried around on the rotating table, I), until it conies in contact with a jet of water from pipe, F, and condnetinc. board, G. The jet, F, conducts the ore into hutch. II, through pipe, I.
The middle or second grade ore is washed off table, 1), by the perforated pipe. E, and is
deposited in hutch. .1. pipe, K. to be re-washed. The head, C, is suspended from frame. 1I, so that it can be readily adjusted relatively to the table as it may be required. The arms and segments should be made of hard pine, about half seasoned. The sheeting or surface should be soft pine, and niu.st be green lumber and perfectly clear. The surface of table must be true and uniform, and the width of the hoards should not exceed 5 in, The boards are joined by tongue and grooves. The speed of machine is one revolution in NO seconds. Pitch or incline of table, 1; in. to 1 ft. Pitch of head, in. to 1 ft. The capacity of the machine is 25 to 30 kilts per day of 24 hours.
The Lbakenbarh Boddie is a stationary, continuons-working, outward-flow table, designed by C, Linkenbach. The table itself is fixed, but both the supply and receiving launders revolve, the advantages thus giined being cheaper construetion and the possibility of using very large tables, requiring small motive force. The principle of the slime washing on this table is the same as with the rotary round table. The slimes are delivered upon a distributing apron at the center, and are discharged at each revolution of the axle, spreading out over the table. The axle carries the perforated wash-water pipes, which extend out over the table, and at each revolution wash the pulp covering the surface of the latter. The headings and tailings are discharged into a circular launder, around the table, which revolves at the Saute rate as the wash-water pipes. The tables are made of thin iron plates, supported by radial arms, covered with a layer of cement about 3 in.
thick. The capacity of a sin gle table. 26 ft. in diameter, is said to be about 15 tons of fine meal and pulp per 24 hours. To economize space, and further cheapen the cost of construction, triple tables are sometimes used, the three being placed one above the other, and the feed-water pipes being carried on the same axis.
The Collom Puddle (Fig.
9) is a convex. circular revolving table, over one-half of which, and parallel with its surface, are fixed six light arms, from each of which are suspended two or three small brooms, lightly sweeping the surface of the table. The pulp is fed at the center of the table, and as it spreads out the coarser particles are stirred repeatedly from their positions and caused to roll outward, or toward the tail end of the table.