go FRANK HEARNE CROCKARD 



hopper, is placed on the dumping machine; when in position, 

 the car is rotated through an arc sufficient to cause a free 

 flow of the ore, which in passing through the chutes is de- 

 flected into four side dumping bridge cars mounted on a 

 transfer car. These bridge cars have a capacity of 17 to 

 20 tons, and the car dumper will easily handle 15 cars of ore 

 hourly. The transfer car is then moved under the machinery 

 tower of the conveyor bridge, where by means of a cable the 

 bridge cars are pulled up on one of four converging tracks 

 to the through bridge track and automatically dumped at 

 any desired point, either in the stock yard or furnace bins. 

 In taking ore from the stock pile to the bins or bin filling cars 

 two methods may be used, and in both cases the buckets are 

 operated by the motors operating the bridge cars. A second 

 track, suspended below the main track, carries a trolley, 

 to which is attached a scraper bucket holding about 10 tons; 

 about 15 buckets per hour can be taken from the pile to the 

 bin filling cars. In the second method, a two part grapple 

 bucket holding about 12,000 pounds of ore is used; 25 to 30 

 buckets are handled hourly by this arrangement. As the 

 bucket operates vertically, it has the advantage of working 

 in the center of the ore pile, where trouble from the frost will 

 be less than working on the inside of the pile. The cost of 

 transferring ore from the cars to the stock pile with the 

 Hulett bridge is said to be less than one cent per ton. 



The ore now being in stock, the next step is to get it 

 to the furnace. In the case of the larger furnaces the ver- 

 tical hoist tower carrying its cumbersome charging barrows 

 was found to be a slow and costly method and has been super- 

 seded by the skip way or incline. The ore train, handled 

 by a small locomotive running on tracks placed between the 

 ore bins, is made up of special cars, each of which carries a 

 charging scale, on which rests the ore bucket capable of hold- 

 ing 10,000 pounds of ore. These buckets, when properly 

 filled with the required kinds and quantities of ores, are pushed 

 under the incline. The central bucket rod, pendant from 

 which is an iron cone or bell closing the bottom of the bucket, 

 is now grasped by a bifurcated hook hanging from the incline 

 carriage; from this point they are rapidly carried to the fur- 



