. Cassier's magazine . tionis a matter very hard to determine,as it depends on the size, type ofinstallation, location, class of build-ings and the foundations requiredfor the machines. The most thatwill be done in this paper will be togive the cost of a few existing in-stallations and machines. Machinesof the Coppee, Humbolt and Shep-pard types cost very much the samefor the same output. A plant for dealing with 200 tonsin a day of ten hours, includingbuildings, cost £4,000. A plant capable of treating 500tons in ten hours, including build-ings, cost about £12,000. A large Humbolt plant for d
. Cassier's magazine . tionis a matter very hard to determine,as it depends on the size, type ofinstallation, location, class of build-ings and the foundations requiredfor the machines. The most thatwill be done in this paper will be togive the cost of a few existing in-stallations and machines. Machinesof the Coppee, Humbolt and Shep-pard types cost very much the samefor the same output. A plant for dealing with 200 tonsin a day of ten hours, includingbuildings, cost £4,000. A plant capable of treating 500tons in ten hours, including build-ings, cost about £12,000. A large Humbolt plant for deal-ing with 1,600 tons in ten hours, in-cluding buildings, cost £40,000. Elliot washer, capable of treating100 tons in ten hours, cost about £750. Elliott washer, for dealing with400 tons in ten hours, cost about£2,000. A large Elliot washer, capable oftreating 1,000 tons in ten hours, in-cluding buildings, cost from £5,000to £ 10,000. Craig washing plant, for dealingwith 400 tons in ten hours, costabout £ ELECTRIC DRIVING FOR MULE SPINNING By Albert Walton In a recent issue of this magazine the relative advantages of rope and electric transmission with in-dividual motors for textile mills was discussed, and it was shown that the question demanded the exerciseof skilled engineering ability and experience applied to each particular instance to determine the properplan to be adopted. In the present paper Mr. Walton discusses the manner in which the difficult problemof driving the self-acting mule by electricity has been treated, and the results of experience are placedat the disposal of engineers and manufacturers.—The Editor. OF the two methods of spinningyarns involving the use ofring spinning frames andmules or jacks, the latter,though the older and more compli-cated, is so superior for certainclasses of work that its simpler rivalhas never been able to entirely re-place it. In the August, 1909, issueof this magazine we took up the sub-ject of the power require
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