FARM MACHINERY 291 



All elevators can now be secured with conveyors which 

 may be installed in the ridge of the crib or granary and which 

 permit the grain to be discharged through a spout to any 

 point. This is accomplished usually by having spouts to fit 

 into removable sections of the bottom, or by shifting the 

 whole conveyor on rollers. If the elevator is to have a perma- 

 nent position in the building, the conveyor is almost essential. 

 If the building is not too large, a better arrangement is to ele- 

 vate the grain to the highest point possible, often to a cupola, 

 and distribute it through a spout to the bins. The conveyor 

 complicates the machine, and should be dispensed with if 

 possible. 



If a two or three-horsepower gasoline engine is at hand, 

 it may conveniently be used to furnish power for the farm 

 elevator; otherwise, a one or two-horse sweep-power should 

 be purchased. 



Selection. The selection of a portable elevator finally 

 resolves itself into the choosing of a machine to suit the kind 

 or kinds of grain to be elevated, and a careful inspection of 

 the construction of the machines, as well as obtaining from 

 the maker a guarantee insuring a satisfactory performance. 



QUESTIONS 



1. Why is the portable elevator an important machine for the farm? 



2. Describe the various mechanisms which are made use of in the 

 lifting jack. 



3. Describe some important features of the construction of a 

 portable elevator. 



4. Of what materials are portable elevators made? 



5. What are the relative merits of cups and flights? 



6. Describe the construction of the derrick. 



7. How are conveyors used in large cribs? 



8. What features should be given careful consideration in the 

 selection of a portable elevator? 



