Show experiments in road building in order accurately to determine the durability of the various kinds of ion lo adway dway the government bureau has a stretch of roadway at arlington representing all the different methods of road building and over tins this it a heavy beavy machine is drawn back and forth by cable tills is supposed to reproduce the action of vehicles passing over it and the results are arc carefully noted and compared tho the result of the operations will bo be utcy as a ode guide to the e expenditure of nearly which will be made mada under government auspices during the next nest three years |