erally in connection with a crane or trolley, to lift 

 the work high enough for convenient transporta- 

 tion to another part of the shop. 



i ins arc used with hand hoists. With drum 

 hoists the winding is usually done with steel wire 

 rope terminating in a shackle, to which the work 

 is slung by a chain and hook. Swiveled hooks of 

 the standard type may be used for most work, but 

 special tongs may be used for plates, bars, etc., 

 \shcn there is much work of the same kind to be 

 handled I tring magnets are used for handling 

 pig iron, scrap iron, and plates. These should not 

 be used for carrying material over the heads of 

 workmen, as a failure of the current will drop 

 the load. Every foreman, using cranes or hoists, 

 s it to himself and to his workmen to see that 

 all ropes, chains, hooks, etc., are inspected fre- 

 quently and thoroughly. 



The Jib Crane. The principal types of cranes 

 are the jib crane and the traveling crane. Each 

 has a field for which it is best adapted. The jib 

 crane, swinging in vertical bearings, is well adapted 

 to serve in a restricted area. The trolley, run- 

 ning in and out on the horizontal swinging arm, 

 enables it to serve an area limited only by the 

 length of the arm. It is t good type of crane 

 where the work to be done is at one point. 



The Traveling Crane. The traveling crane, 

 with its two trucks, running on elevated tracks 

 and connected by a bridge, is better adapted for 

 serving large areas. Traveling cranes vary all 

 the way from simple affairs, carrying a hand chain 



