CABLEIVAYS. 



191 



less rope serves to hold the carriage in place while 

 the hoist is being made. For horizontal motion the 

 hoist rope is drawn in and the endless rope is paid 

 out at the same rate of speed. As will be observed, 

 the load may be hoisted or lowered at any point un- 

 der the line of the cable, and the horizontal motion is 

 given the load at any height to which it may be 

 raised. 



A cableway at Austin Dam 1,350 feet span handles 

 loads up to eight tons. 



A cableway used for building the Basin Creek dam 

 in Butte, Montana, spanned both a quarry and dam, 

 and stones were picked up from the quarry and de- 

 livered without rehandling. 



The United States Corps of Engineers, under Lieu- 

 tenant W. E. Craighill, used a cable for building the 

 lock and dam on the Coosa river, near Lincoln, Ala. 

 The plant was erected in the spring of 1891 ; span, 

 1,000 feet ; main cable, two and a half inches; load, 

 eight tons. 



Fig. 



The heavy take-up device (Fig. 5) is not intended 

 to be used in erecting the plant, but it is to take up 

 the stretch occurring as. the cable is used, or in raising 

 the cable as the dam increases in height. 



One great advantage of using a cableway lies in 

 the employment of a shallow skip, which, as will be 

 observed, is easily filled by hand, with no preliminary 



Fig. 



work after a blast. At least two tons per man per day 

 more may be filled into a skip eighteen inches high 

 than into a car thirty-six inches high. 



The stone for this lock and dam was procured from 

 a quarry about two miles back from the site of the 

 dam; a three-foot gauge road was built and equipped 

 with locomotives and cars. Each car held as its 

 body, a skip which was picked off the car by the 

 cableway, and by it delivered into place. The mate- 

 rial used was brick and loose rock. At Point Pleas- 

 ant, W. Va , is a Lidgerwood 

 cableway, used for building lock 

 and dam. One tower is 100 feet 

 high. The cableway is used 

 every day for transporting stone from the quarry to 

 the stone yard. The supplies and materials arriving 

 by boat -are unloaded upon the coffer-dam or upon 

 the dock boat, and brought ashore by the cableway 4 . 

 It is found a great convenience in taking men across 

 the river, as it is much more expeditious than ferry- 

 ing them. 



This plant has the distinction of being the largest 

 hoisting cableway in existence, the clear span being 

 1,505.5 feet; main cable, two and a half inches dia- 

 meter; maximum net load handled, four tons. A 



