. History of the Panama canal; its construction and builders . 1. Main shaft for crushing plant at Porto Bello. 2. Stone breaker. (Supplied by the Allis-Chalmers Company, Milwaukee, Wis.). Twenty-two-foot horseshoe shaped Blaw Steel Form for culvert construction, Panama Eighteen-foot round Blaw Steel Forms showing telescopic features used for culvert construction in the canal locks.(The Blaw Steel Construction Company, Pittsburgh, Pa.) COLLAPSIBLE STEEL FORMS 373 the rapidity with which work could bedone. After considerable study of the problem,the commission adopted a design furnished
. History of the Panama canal; its construction and builders . 1. Main shaft for crushing plant at Porto Bello. 2. Stone breaker. (Supplied by the Allis-Chalmers Company, Milwaukee, Wis.). Twenty-two-foot horseshoe shaped Blaw Steel Form for culvert construction, Panama Eighteen-foot round Blaw Steel Forms showing telescopic features used for culvert construction in the canal locks.(The Blaw Steel Construction Company, Pittsburgh, Pa.) COLLAPSIBLE STEEL FORMS 373 the rapidity with which work could bedone. After considerable study of the problem,the commission adopted a design furnishedby the Blaw Steel Construction Com-pany, of Pittsburgh, as being best adaptedto canal work. Contracts were awardedto this company, and the forms wereshipped to the Isthmus in July, 1909, andJuly, 1910. The accompanying illustra-tions give a clear idea of the manner inwhich the forms were used for culvert con-struction in the locks. The forms wereof great size, measuring in some casestwenty-two feet in diameter, and were thelargest in existence at that time. In thetropical climate of Panama wood formswould have warped and caused no end oftrouble by losing their shapes, but the steel
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