INDKl'HNDKNT STKKI. (-KAIN KU-.VAI < )K. 



337 



trippers provided with spouts are provided, so that grain may be discharged on either side of the 

 belt. Tin- t-iit ire conveyor is carried on a steel framework. The conveyor belt is driven by a 

 40 II. P. motor. The conveyor in the tunnel leading from the storage tanks to the working 

 house is of the same type as the conveyor above the bins, and is supported on a steel framework, 

 except that the top or carrying rolls are all of the concentrating types, as shown in Fig. 10. The 

 coucriitr.it ing rollers arc composed of two straight-faced rolls from the main shaft, and two 

 concentrating rolls meeting at an angle of 45 to the straight rolls. The lower conveyor is driven 

 by a rope drive from the main line shaft in the working house. 



FIG. 13. DETAILS OF STEEL ROOF TRUSS FOR STEEL BINS, INDEPENDENT ELEVATOR. 



Scale Hoppers. There are three scale hoppers of 1,800 bushels capacity, each mounted 

 on a Fairbanks-Morse and Company's scales, having a capacity of 84,000 lb., and have steel 

 frames. The hoppers have fs-in. steel plate sides, and {-in. plate bottoms, stiffened with angle 

 irons, and are tied together with tie rods. Each hopper is provided with a 22-in. cast iron outlet 

 with a steel plate cut-off gate. 



Garners. A steel garner hopper is placed directly over each scale hopper. The garners 

 have a capacity of 1,800 bushels, and are constructed with A-in. side plates and }-in. bottom 

 plates. The bottoms of the garners are hoppered to four openings, which are provided with gates 

 sliding on steel rollers. 



Cleaning Machines. A large size cleaning machine and a large size oat clipper are provided. 

 These machines are connected with a large dust collector which discharges the dust from the 

 cleaning machines and from the sweepings outside of the building. 



Car Puller. A car puller having a capacity of 25 loaded cars is provided. The car puller 

 has two drums, each provided with 400 ft. of f-in. crucible steel cable. 



Shovels. A pair of Clark automatic grain shovels, with all necessary counterweights, sheaves, . 

 scoops, etc., are provided. 



The total weight of steel in the elevator is 1,700 tons; approximately 900 tons in the working 

 house, and 800 tons in the circular bins and conveyors. 



The total cost was $205,000, of which the 8 steel bins and conveyors cost $80,000. 



COST OF STEEL GRAIN ELEVATORS. The following costs of steel grain elevators have 

 been taken from the author's " The Design of Walls, Bins and Grain Elevators," which also gives 

 costs of reinforced concrete and tile bins, and timber grain elevators. The total cost of the steel 

 grain elevator of the working house type, constructed by the Great Northern Railway at 

 Superior, Wis., was 39.65 cts. per bushel of storage. The elevator had a storage capacity of 

 3,100,000 bushels, and the steel weighed 7 lb. per bushel of storage capacity. The Independent 



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