Illinois Society of Architects · Chicago · leaf 250
otmaterial, such as partly quenched ashes. Cheap rubber filling, however, isobjection-able because it is always of the lowest gradeand poorly vulcanized, so that it is muchshorter lived than the cheaper coal tar gums. The idlers on which belt conveyers runshould be spaced not more than 4 feet… … Northwestern University, Evanston, III., Westcolt & Ronneberg, Engineers STEEL AND REINFORCEDCONCRETE, BUILDINGSBRIDGES, FOUNDATIONS ETC. 1049-51 OTIS BUILDING Cor. Madison and La Salle Sts.Telephone Main 784 CHICAGO STRUCTURAL ENGINEERS IIG South Michigan Blvd., CHICAGO DESIGNING ENGINEERS FOR…
Architecture · Building · Architects
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