SCIENCE OF SUCCESSFUL THRESHING 



When firing with straw, keep the chute full all the time, 

 so that no cold air can get in on top of the fire. Take 

 small forkfuls and let each bunch of straw push the preced- 

 ing one into the fire. Occasionally turn the fork over and 

 run it in below the straw in the chute to break down and 



-WAGON TOP 



HAND HOLE 



FIRE BOX 

 _ TUBE HEAD 



FIG. 9- SECTIONAL VIEW OF FIRE-BOX FOR BURNING STRAW. 



level up the fire. Three grates, spaced equally across the 

 fire box, are better than more. Keep about fifteen inches 

 of the front of the ash pan clean, to allow plenty of draft, 

 but let ashes fill up in the rear part. Four bricks must be 

 used. Keep rear draft door shut. 



The flame coming over the brick arch as seen through 



