MOTIVE POWER AND ROLLING STOCK 
351 
Sequoia Spark Arrester. — This arrester^ has a ^-inch mesh 
wire screen (A) which projects above a cinder pan (B) attached 
to the stack. From the cinder pan outlet pipes (C) lead to a 
receptacle below. A light metal deflector is fixed inside the 
pan to guide the cinders to the outlet pipes. The sparks arrested 
and deflected by the screen are dropped into the receiving pan. 
This arrester is used chiefly for wood-burning logging engines. 
Users claim that the engine exhaust will keep the screen clean 
Fig. 117. — The Sequoia Spark Arrester. 
and that it does not interfere with the draft. The device is light, 
and is easily put on and removed. 
Radley-H unter Spark Arrester. — This is an effective locomotive 
spark arrester- which is used by many lumber companies. The 
smoke and cinders pass up through the main smoke chamber 
(A), striking against a spiral cone (B) which gives them a whirling 
motion, and large cinders are thrown outward by centrifugal 
force against the perforated screen plate (C). This plate has 
openings large enough to permit the passage of cinders into the 
spark chamber (D). Once through this perforated screen plate 
the cinders are beyond the line of active draft, and by their weight 
fall into the receptacle (G) from which they are removed through 
the cleaning-out holes (F). The lighter cinders which are not 
1 Fig. 117. 
2 Fig. 118. 
