Treatise on Coke Page 115
The slate gate or refuse discharge l is raised and lowered at will by the lever m. The opening at k is adequate to pass a 4-inch cube, and is the entire width of the jig; the lever m is fitted to a radius of a half circle with slot to accommodate the opening and shutting of the gate l, and is fitted with handscrew so as to enable the setting of this gate at any height. The operator of the jig, after becoming familiar with his coal and the amount of impurities it carries to the ton, very readily learns about the distance to leave his gate open, necessarily making the jig as near absolutely automatic as any jigging process that has ever been developed. The coal, after having been separated from its impurities, passes over the top of the jig box d and out to j, into what is termed the settling basin n, where it is allowed to settle to the bottom, there being very little disturbance of the water in n; thence it is delivered by a perforated bucket elevator to any point desired. The next important feature is the water circulation, the water being used over and over again. The only fresh water required is the water that is actually consumed or absorbed by the coal in the process of washing. The water from the basin n, which overflows from the top into a well is carried by any means desired — commonly a centrifugal pump on account of capacity and low duty — into what is termed the supply tank o, thence through opening p into tank e to valve q. As the jig box d moves up, the valve being a cast iron swinging check, admits the water through p into e and fills the vacancy caused by the upward motion of d. On the downward motion of the box d, the valve q closes and the water is forced through the perforated bottom of the jig box d and the same process is gone over and over as has been cited. The gate in front of the jig box is left open at a certain point, which is governed by the amount of slate and impurities to the tonnage of coal being washed. The down motion of the jig loosens the slate bed in the bottom and works it toward the front, or discharge, side, where it is discharged into the jig tank e under the jig box and is carried by a chute or hopper to a point where it is taken up by the refuse elevator and carried out. The peculiar arrangement of this jig box with the perforated bottom fitted into the tank gives a very sensitive with which the jig distinguishes the difference between materials of a very close specific gravity; for instance, in one case where the coal varies in specific gravity from 1.29 to 1.37, the bony coal from 1.38 to 1.56. the shale from 1.40 to 2.04, and the slate from 1.70 to 3.40, an average from forty-nine samples of run-of-mine coal shows the coal, 82.6 per cent; bone coal, 11.4 per cent.; shale, 4.5 per cent.; slate, 1.5 per cent. The following is the result of eleven samples taken from the washed product: Coal, 92.9 per cent.; bone, 5.3 per cent.; shale, 1.8 per cent. The refuse or tailings show coal, 3.8 per cent.; bone, 18.2 per cent.; slate and shale, fireclay to contend with, mixtures of coals from three different places were washed. |
Some base dimensions![]() The Jig Box was just a quick and dirty drawing without any real attempt to get any accuracy. Note that the dimensions were created through a long process of re-constructing the Washery and are basically .. what was left after fitting the other pieces together. The Jig Box sits between the walls of the Jig Tank and has a maximum width of 1.396″ as shown. From the article above we have … “The jig tank e is built in size to suit the jig box so as to allow it to swing free. The tank is bushed in on four sides with iron plates to fit squarely against the same character of plates on the jig box, giving the result of a practically tight joint, but at the same time giving the jig sufficient play so that it can be moved up and down by the eccentrics f and g hung on the two pieces of shafting just over the jig.” Looking closer at that .. we have
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![]() It measures w.306″/about 110″ FS. Subtract the 0.032″ (x2) and we get a Jig Box with a 2.242″/107.6″ FS length. With that we can jump to the Jig Box |
Section IV : Jig Box etc. — Jig BoxOverview I am going to be referring a lot to the text on Jig Box etc. but am going to try and parse it down quite a bit. d is a jig box, about 5 feet x 7 feet Ummm .. no. I ended up fitting the Jig Box to the Jig Tank. I ended... Section IV : Jig Box — EccentricsFrom Plan The text states that the Jib Box is about 7' x 5' so I used that to scale the eccentrics. The whole thing is really just a guess at best. The shafting is shown in Purple. I scaled these to 7". In O scale that is 0.146". I checked my stock and I... |
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