3o8 



LOGGING 



a tight case which is designed to prevent the entrance of grit and 

 other foreign substances. 



Heisler locomotives of 35 tons weight cost about $7000 and 

 those of 55 tons weight cost about $9000. 



(2) Side Shaft. — The Shay locomotive is the only one of 

 this type on the market. It is built in weights ranging from 13 

 to 150 tons. 



The frame is made of heavy steel "I" beams braced with 

 trusses, and is supported on from two to four pairs of four-wheel 



Fig. 87. — A Heisler Geared Locomotive. 



swivel trucks. Locomotives weighing 55 tons and less have two 

 trucks; those from 65 to 105 tons, inclusive, three trucks; and 

 the 1 50- ton locomotives, four trucks. The additional trucks in 

 the two latter are used to carry the tender. 



The boiler is of the horizontal locomotive type with extra 

 large fire box and steam space. The engines are of the vertical 

 type and are attached to the boiler plate on the right-hand side 

 just in front of the cab. Locomotives of from 13 to 20 tons 

 weight are equipped with two cylinders, and those of greater 



