Show GRAVEL TO SURFACE ROADS with good material and a little attention highways should last for several years my by E 11 HOUSE colorado experiment station i thero there has been much agitation during tho the past year concerning the surfacing of our principal roads and as in many parts of the state we find d deposits e of gravel it seems that this Is the material which may be economically used A few words concerning tho the construction of these roads may not be out of place first of all the construction should be such that the gravel Is confined and held in position on the road this is accomplished by so grading the earth foundation that shoulders are formed at the sides bides the earth forming th the a shoulders should be well compact and solid otherwise they will fall fail in the function required of them loose earth thrown up from the ditch at the sides of the road will not answer the pur I 1 lose ose unless moistened and rolled with A seven or tenton ten ton roller the whole surface of the earth foundation should be graded to the required form and compact with the roller and the gravel then spread in a layer about tour four inches thick in the center and two and one halt half inches at the side enough solid sand or loam is then added to make the gravel bind well this toils ts Is mixed with the tha gravel with a harrow and the layer Is then sprinkled and rolled until solid another layer of 0 gravel Is then spread over the first and treated in tho the same way the result Is a graveled surface 16 15 feet wide ano and six inches thick at the center and throe three and one tiala inches thick at the sides and if the gravel Is of a good quality this road with a little attention should last tor for years |