Chicago : Engineering and Contracting Pub. Co. · leaf 505
s sub-stance at the bottom of the openings, a layer ofsand resting on the layer of bituminous sub-stance, and a second layer of bituminous sub-stance resting on the layer of sand and extend-ing to the top of the vertical opening.No. 511,497. Pavement. George E. Blaine, Al-liance, O., inventor;… … Fig. 7—Pavement Constructed wi-hDunn Block. No. 511,497. Pavement. George E. Blaine, Al-Streets, Etc., and Blocks Therefor. JosephS. Winter, Montgomery, Ala., inventor; pat-ented Jan. 2, 1894; application filed Dec. 6<1892. The principle involved in this invention was toprovide for drainage down…
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