Highway Engineering - Classic Reprint Author:Charles E. Morrison Since in transportation of any kind, whether by means of cars as on railways, or wagons as on ordinary roads, the object is to haul a load as cheaply as possible-that is, aside from the questions of initial cost and maintenance and repair, to haul the greatest load with the least expenditure of energy-it will be quite proper in the subject of ro... more »ads and pavements to consider first those factors tending to affect the tractive force per unit load and thus the cost of transportation.
By tractive force is meant the force exerted by a team in drawing a load over a road, and it is usually expressed in pounds per ton. The resistances to be overcome, called tractive resistances, are due to the load itself and the wagon carrying it. The general term tractive resistance, as applied to wagon haulage, may be separated into three parts: (1) Axle friction, (2) Rolling resistance, and (3) Grade resistance; and from this consideration the most advantageous condition of road transportation may be deter
Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion, History, Folklore and Mythology.
Forgotten Books' Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the difficult to read text.« less