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A. E. Hunt Allegheny Allegheny County Allegheny river American Society amount appointed Becker black powder brick bridge building stone cartridge cent centre chemists Civil Engineers clay committee cost county engineer crushing cut-water cylinder Date of Membership Dempster diaphragm district drift durable dynamite elastic limit elected explosion feet granite H. D. Hibbard heat highways I. S. McGiehan inches iron J. A. Brashear J. W. Langley Johnstown Kirk L. S. Clarke limestone load masonry material matter meeting metal Metcalf miles paper Pennsylvania Pennsylvania railroad phonograph piece pier Pittsburg plate portion pounds President rail railroad record river road directors rock sandstone Sept Simplon railway Society of Western South Fork dam specimens square steel stream strength stria T. P. Roberts tensile strength testing machines Thaw tion tons township W. L. Scaife weight weld