IO4 ROUGH-AND-TUMBLE ENGINEERING 



l /2, as the percentage of increase of power does not 

 equal the percentage of loss in economy. The nearer 

 you bring the reverse lever to center of quadrant, the 

 earlier will the valve cut the steam and the less will 

 be the average pressure, while the farther away from 

 the center the latter in the stroke will the valve cut the 

 steam, and the greater the average pressure, and con- 

 sequently, the greater the power. We have seen en- 

 gineers drop the reverse back in the last notch in order 

 to make a hard pull, and were unable to tell why they 

 did so. 



Now, as far as doing the work is concerned, it is 

 not absolutely necessary that you know this; but if 

 you do know it, you are more likely to profit by it and 

 thereby get the best results out of your engine. And 

 as this is our object, we want you to know it, and be 

 benefited by the knowledge. Suppose you are on 

 the road with your engine and load, and you have a 

 stretch of nice road. You are carrying a good head 

 of steam and running with lever back in the corner or 

 lower notch. Now your engine will travel along at its 

 regular speed, and say you run a mile this way and 

 fire twice in making it. You now ought to be able to 

 turn around and go back over the same road with one 

 fire by simply hooking the lever up as short as it will 

 allow to do the work. Your engine will make the 

 same time with half the fuel and water, simply 



