Handling Intlnitlitnl Piece* 71 



>> from one department to another, and even 

 n one building to another. It is capable of 

 handling moderate loads up to 4,000 Ibs., and 

 Dually used in connection with electric hoists. 

 Some specially designed overhead trolleys are 

 made with I -Beam tracks and carry loads as high 

 as t Ihe simplest ones may be only 



.light beam carrying a chain hoist and 

 operated In the workmen entirely from the floor. 

 The more elaborate ones may handle the internal 

 sport.ition for a whole plant, running in and 

 of buildings, with switches, turnouts, etc., and 

 operated by men carried in cabs mounted on the 

 .irriagc. These serve the same pur- 

 pose as an industrial r ail way, with the advantage 

 that they leave the floor free from tracks. 



Industrial Railways. Industrial narrow gauge 

 railways are used to carry loads of almost any 



.:ht. I : plcst means of moving 



heavy material, but they are a mixed blessing. 



tracks take up a great deal of room which 



must be given over permanently to this purpose, 



rhcr they arc in use or not. They form an 



obstruction and the curves or turn-tables always 



more or less trouble. They arc generally 



tpcr to install than an overhead trolley. In 

 plants handling very large and heavy work, where 

 there is also a traveling crane, the tracks are 

 usually of standard gauge, rect connection 



he railroad spurs outside. This arrangement 

 permits the "spotting" of railway cars under the 



eling crane, so that large pieces may be picked 



