164 



FARM ARITHMETIC, 



573. When used on the thawing dirt road? 



574. When used on the dry dirt road in good condi- 

 tion ? 



575. When used on sod land that is wet and spongy ' 



576. When used on freshly plowed land? 



577. How much more draft is required for hauling 

 one ton net over freshly plowed ground than over wet, 



Before the Coming of Modern Wagons. 



spong}^ land when high wheels are used ? Percentage dif- 

 ference ? 



578. Assuming the draft per ton to be the same when 

 che loads are greater than those used in the experiment, 

 find draft for net load of two tons on high and low- 

 wheeled wagons on dry earth road. On wet sod. 



579. How much more draft is required for hauling a 

 load weighing one ton over dry gravel road than over 

 dry dirt road? Percentage difiference? 



