980 



ANNUAL REPORT OF THE 



Off. Doc. 



ROAD STATISTICS. 



TABLE I. 



Force Required to Draw a Load on Different Kinds of Roads. (Gil- 

 more.) 



hoi 



■013 

 « OS 



h ° 



a 10 ™ 



o rf ft 





Draught on a Level Compared with that 

 on Difficult Grades. Rise in Feet per 

 100 Feet. 



3 

 O 



fe 



Earth road 



Gravel road 



Macadam road, 

 Telford road, ... 



Plank road 



Stone track way, 



Pounds. 



200 



i43y2 



65 

 46 



41 

 12 V4 



2.7 

 3.8 

 6.1 

 S 2 

 9.1 

 27.5 



TABLE 11. 



Tractive Force Required for Carriages of One Ton on a Level Road. 



(McConnell.) 



Description of Road. 



1. On rails 



2. Well-made pavement 



3. Macadamized road ; 



4. Turnpike, hard and dry, .. 



5. Turnpike, dirty 



6. Hard compact loam 



7. Gravrt, 



8. Sandy and gravelly, 



9. Ordinary by-road, 



10. Turnpike, newly gravelled, 



11. Loose sandy road 



Force of Trac- 

 tion per Ton. 



8 pounds. 



33 pounds. 

 44 to 67 pounds. 



68 pounds. 



88 pounds. 

 119 pounds. 

 150 pounds. 

 210 pounds. 

 2:i7 pounds. 

 320 pounds. 

 457 pounds. 



A horse produces his sfreatest mechanical effect in drawing a load 

 two and one-half miles per hour with n iractive force of 150 pounds. 



