

REPOUT — 1902. 



(vi.) A load of 1,800 kilos on a cart with tyres 0-06 m. in width, on a 

 good macadam road with a wet surface, causes considerable deterioration 

 to the roadway ; therefore the maximum load under these conditions 

 should not exceed 2,000 kilos, unless their tyres exceed 0'07 m, in width. 



(vii.) The distribution of a load on two or more vehicles, pi'oducing a 

 distribution of the pressure over a larger surface, causes less damage to 

 the road. 



(viii.) A load of 8,000 kilos on a macadam road with a wet surface 

 causes considerable damage, and this limit ought to be considerably 

 reduced if the roads are to be kept intact. 



(ix.) A spring carriage going at a trotting-pace with loads of 5,000 

 kilos on macadam roads with wet surfaces does not cause any more damage 

 than the same vehicle without springs proceeding at a walking-pace. 



(x.) The best limit to fix for the fore-wheels of waggons is 1 to 

 1*10 m., and for the rear- wheels 1'50 to l'60m., in accordance with tho 

 construction of the vehicle. 



The following table gives the results (after General Morin) of the 

 relation between the tractive eflbrt and the total load for difl'erent kinds 

 of roads and vehicles : — 



General Morin's Table for the Ratio of Tractive Force and Total Load. 



Description and State of Roads 



Turf, softened by melting snow 



„ firm ...... 



,, very dry ..... 

 Eartliways in good condition, drj', ikc. 

 Earth road, covered with untrodden 



snow. 

 Firm earth, with a bed of sand or 



gravel 01 to 0-15 m. in thickness. 



Macadam, dry and uniform 



,, wet and dusty, projecting) 



stones. )' 



„ firm, slight wear, and soft i 

 mud. i 



„ firm, with ruts and very i 

 muddy. j 



„ worn and covered witli i 

 thick mud. ) 



,, badly worn and rutty, mud , 

 very thick. f 



„ very badly worn, and with 

 deep ruts, hard founda- 

 tion, and unequal sur- 

 face. J 

 Sandstone roads, well set, and closely ) 

 laid. ■ I 

 Roads paved with Fontainebleau i 

 sandstone, dry. ) 

 Paved roads, wet, and covered with i 

 mud. j' 



Timber flooring of a bridge . » 



I Artil- 



iwaggons Waggons j 



Goods 



Carts 



Coaches and 



Carriages with 

 Springs 



24 



1 





1 



•Mi 



40 



it0J= 



JL 



40 



:tO. 



(3V walking. 

 t J^ trotting. 

 J Tj^jj walking. 

 tjV trotting. 

 ( J,: walking. 

 I ~ trotting. 

 ( ^'-j walking 

 I j\ trotting. 

 ( J^ walking, 

 t jV trotting. 

 (jt walking. 

 t j'-j- trotting, 



'15 walking. 

 1 jL trotting. 



! ( jtV walking, 

 ' ' 'S; full .log. 



f -^ walking, 



i =-'g trotting. 



I Jj walking. 



1 J5 trotting. 



fjL walking. 



(5I trotting. 



