. Cassier's magazine . by eachroom. In Fig. 1, which shows therope system of a 1,200-horse-powerengine, there are eleven ropes from115 feet to 186 feet in length to thethree shafts in the lower room andsix ropes 178 feet long to the secondroom. There are five ropes 186 feet longto the third room shaft and there arenine ropes of 161 feet and 198 feetto the two shafts of the fourth are three ropes to one shaftand five to another, and there is atwo-rope horizontal transmission of95-foot ropes to a third shaft, whichcould not be driven directly from thelarge rope- pulley because of the
. Cassier's magazine . by eachroom. In Fig. 1, which shows therope system of a 1,200-horse-powerengine, there are eleven ropes from115 feet to 186 feet in length to thethree shafts in the lower room andsix ropes 178 feet long to the secondroom. There are five ropes 186 feet longto the third room shaft and there arenine ropes of 161 feet and 198 feetto the two shafts of the fourth are three ropes to one shaftand five to another, and there is atwo-rope horizontal transmission of95-foot ropes to a third shaft, whichcould not be driven directly from thelarge rope- pulley because of the in-terference of the shaft in the roombelow. The pulleys in the three up-per rooms all have a diameter of 4feet sH inches, to run at 350 revolu-tions per minute, and those in thelower room are 6 feet 2%-inch diam-eter and run at 250 revolutions perminute. Where there is more thanone shaft in a room the other oarallelshafts may, as shown, be driven fromthe main shaft by ropes of the samesort. DRIVING OF COTTON MILLS 293. 294 CASSIERS MAGAZINE Where the scutching departmentoccupies one end of the mill beyondthe rope race, the necessary shaft iscontinued through, as shown in thissame illustration, while another shaftis continued through and drives by ahorizontal rope from the scutchingroom to the dynamo room, drivingthe dynamo for the electric main pulley is 26 feet diameterand has thirty grooves for 1 ^4-inchropes at 2 5/16 inches pitch to runat 4,900 feet per minute. One lineof the shafting in the lower roomdrives the carding engines, two linesdrive the combs, and the furthershaft drives the frames and runs at300 revolutions per minute. The latest systems of power dis-tribution are (d) electrical. In onemethod there may be a motor on eachline shaft, current to this being trans-mitted by cables either from an elec-tricity generating plant in the millitself or from an outside power sta-tion. In Italy it is usual for practi-cally every machine in the mill to bedriven b
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