TELPHERAGE. 



281 



caiTvino- as much as 10 tons. The order of procession is, first, a telpher 

 with four or live trailers, then anoJiier telpher and four or five trailers, 

 and a telpher at each end. The placing- of these telphers at intervals 

 greatly adds to the traction, while the distribution of weight over the 

 whole span, or over two or three spans, enables much lighter construc- 

 tion to be used for greater capacity. 





J^^ 



Fig. C— Overhead telpher tracks, parallel to lait at the side of railroad traeks. Standard railway 

 baggage truek. Telpher, trailer, and electric hoist. Control ])y telpherman. 



liy means of space-covering or movable telpher tracks coal can be 

 deposited or removed from any portion of the storage yard, and not 

 merely from beneath the telpher track. This track, mo\al)le by hand 

 or electric power, greatly reduces the necessity of a multiplicity of 

 telpher tracks and switches to serve all the space. The top surface of 



Kii;. 7.— side elevation of freight car.s, telpher track, telplier and tliree trailers, cne iclplii 

 controls inoviinciit ol train and hoisting and lowering of the loaded trucks. 



the coal thus deposited is hoi-i/ontal, and not in j)(>aks. so tiiat 

 whole vertical space can be utilized. Sand, gravel, earth, sulpl 

 or various chemical products can l)e as easily raised, ti-an.sported. 

 diunped into vessels or cars. 



L(n/(n/fs. — Much engineering skill is rcMjuii-ed to l;i\- out oi' })lan 

 telpher lines foi' any proposed work in oi-der to decide whether 



the 

 uir, 

 and 



(lie 

 Ihe 



