STONE AND CEMENT CONSTRUCTION, 

 SUMMARY Concluded. 



509 



PROBLEMS. 



1. The road marked (a) in the summary was a dry gravel road 

 with sand 1 inch deep; the length of the run was 400 feet; what per 

 cent of advantage was there in the draft of high over the medium 

 wheels? Of the medium over the low wheels? 



2. At the rate given in the table, the draft required to draw 2,000 

 pounds on the low wheels, would draw how many pounds on the medium 

 wheels? On the high wheels? 



3. If we consider the number of pounds gross and net weight each 

 pound of draft pulls, as given in the table; construct a table showing what 

 1 pound of draft will draw under each of the several conditions. 



4. The road marked (b) is one-half inch of wet sand, with ground 

 frozen underneath ; the grade is 1 in. in 44 ; referring to the table, what 

 is the advantage of high over medium wheels in pounds? In per cent? 



5. What is the difference in draft required to pull 2,000 pounds on 

 a wet spongy sod, that is level, and the draft required to pull the same 

 weight up grade 1 in 12.7 on dry firm earth using high wheels? 



6. If 1 pound of draft will draw 10.6 pounds on a high wheeled 

 wagon over a dirt road that is frozen solid but sticky on top, and the 

 same wagon requires 1 pound of draft to draw 18.5 pounds over a 

 macadam road in fair condition, what will be the difference in pounds 

 of draft required to pull 2,000 pounds over the two roads given above? 



7. If a low-wheeled wagon requires 233.8 pounds draft to pull 2,000 

 pounds over a sticky dirt road in bad condition, how many pounds will 

 the same number of pounds draft (233.8) pull with a high wheeled 

 wagon over a macadam road? 



