tingphase of the workhas been found,however, in theconstruction o fspecimen roads ofvarious kinds indifferent parts ofthe country. Or-dinarily three styles of road hav» been represented in this experi-mental work—a modern macadam, a sand and a dirtroad. Of these three the macadam highway is themost… … Road Scraper at Work. foundation three separate layers of the best qualityof stone that is procurable in the vicinity. Thefoundation course, which is about five inches in thick-ness and made up of two and one-half inch stone, isthoroughly rolled before the second course, composedof one and one-half…
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