Show somo some substitute for raw fear expressed for raw lumber 1 u 1 bar wm will havo have to lumber supply joun fou hd lf if we wc are to continue t the present rate of building construction it is ia not by 11 A jeffries builder chicago H B imagination that our raw griir r supply ig is rapidly rapid lybe bc bining wining exhausted but an actual problem conceded by all who have to ical ica with it the forests of pennsylvania are arc practically gone and those f tile middle north are arc rapidly disappearing the yellow pine of tile south and tile tho fir ur trees of the northwest must now supply not only the of their own sections but those of other sections where the trees lave disappeared ito ile enforced concrete is tile alio best substitute that has yet been found pmj was discovered in the early sixties by a 11 french gardener by lame who found himself in difficulties because of a lack of tubes for liis his NO jio contrived a temporary tubo tube mado of wiro mesh plastered with mortar a proved so BO good a substitute that lie ho mado all of his tubes in that alint manner is composed of broken materials of various kinds and sizes known as the aggregate which is thoroughly mixed with concrete allica subjected to tension 0 stress this material is very weak and to overcome this defect rods of iron or steel are placed in the concrete and the material is then known as ro re enforced concrete it was first introduced laced in building construction with theider tho the idea of making fireproof buildings and in this was successful but lumber was still required and until some form 0 o construction that will eliminate entirely tile use of lumber in tho the building of houses is discovered we shall always bo be confronted with the problem of a jumber fai famine nine |