248 



PELL SYSTEM TECHNICAL JOURNAL 



realized. Less men are required for crane or derrick operation, and 

 the cranes and derricks do the work much more rapidh'. 



In order to move the poles about the yard it is not necessary to 

 retain a freight car to carry them, since small rail dollies have been 

 provided for this purpose. The two dollies shown in Fig. 14 are 

 separate and can be located under the poles at any distance apart 

 tlepcnding upon the lengths of the poles. 



The tractor crane which is used for poll.- lianilling in ilie smaller 

 plants is operated !)>• a hea\\- duty gasoline engine and it is able 



I'ig. 15 — Stiff lAg IX'rrick Removing Poles fromyrrcating Tank anil Loading Them 

 on Flat Car 



to handle a 1,01)0 11). load at .i !•') font radius tiudugh an arc of about 

 270 degrees. It has a 30 fool liooni. Since a very large percentage 

 of the chestnut poles handled, wiigh less than one ton each, this 

 tractor crane has sufficient capacity for the ser\ ice. 



In the smaller plants where it has been found tlesirai;le to increase 

 the pole treating capacities aboxe what could be handled b\- means 

 of the tractor cranes, stilT leg derricks ha\-e been installed. Thesi- 

 derricks are of 6-tons capacitN', ha\ing 4.5-foot booms. They are 

 operated by steam from the ireatint; plant boiler, which fi-eds the 

 H H.P. hoisting engines. In- these Inst, ill. itioiis tlu' swingers are 

 operated by the hoisting I'ligiiies. 



Where the treating plant is of large enough cap.icitX' to warrant 



