. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ficient for friction. The foot-pounds persecond divided by 550 give the horse-power required for the battery. Foundations.—Owmg to the rapidity of the blows and the excessivevibration caused in stamping, it is absolutely necessary to secure a firmfoundation for the battery, and the usual plan adopted in ordinaryground is as follows : The vertical mortar blocks {a), fig. 171, are generally of a length of 261 262 MACHINERY FOR METALLIFEROUS MINES. from 6 to 10 ft. sunk in a pit d
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ficient for friction. The foot-pounds persecond divided by 550 give the horse-power required for the battery. Foundations.—Owmg to the rapidity of the blows and the excessivevibration caused in stamping, it is absolutely necessary to secure a firmfoundation for the battery, and the usual plan adopted in ordinaryground is as follows : The vertical mortar blocks {a), fig. 171, are generally of a length of 261 262 MACHINERY FOR METALLIFEROUS MINES. from 6 to 10 ft. sunk in a pit dug in the ground, and are well packedfor 2 ft. all round with concrete, or clay and stones. The bottom block (/y) has a section of 18 in. x 12 in., and themortar blocks (a), of which there are two or five to each five-head batteryaccording to the size of the timber which can be obtained, are 18 and of a width equal to the length of the mortar boxes (e), connectedtogether by i|-in. bolts, and cross timbers having 12 in. section. Thetops of the mortar blocks should be slightly dished in order to prevent. Fig. 171.—Stamp Battery: Ten Stamps. a a Blocks. l> Bottom Block, c Mud Sills, d ci Cross Sills, ec Mortar J Main Posts, gg Guides, h Screens, kk Stamp Stems, iii Tappets. ;; « Cams,o Cam Shaft. />/> Hangers, r Driving Belt, .s Brace. / Stamp Head. ;< TighteningGear, v Shoe, zv Die. .r Countershaft. them getting rounded. The cross sills (d d) carry the upright main posts(//) and also the mud sills {c) the whole being strongly bolted is well to put a triple layer of well-tarred blanket between the mortarboxes and the blocks, to which they are bolted down with i;|-in. bolts. When the ground is marshy or otherwise unreliable horizontalfoundations are used which spread over a great area. The ground isdug out for from i to 3 ft. deep, carefully levelled, and bottom timbers. CONSTRUCTION OF THE STAMP BATTERY. 263 I ft. X 1 ft. X i8
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
