Engineering and Contracting . mains, is good for a width of 15 ins. to 44 ins., anda depth of t! or 8 ft. The best record withthis type of scoop was made by S. B. of Woodlawn, Pa., on work atConway, Pa. He dug in eight hours 4u(l ft. ofi) ins. :md is ofthe inverted porcupine style. The engine is8x8 ins. The weight of the complete machine is about lbs. The machine is made bythe Keystone Driller Co., Beaver Falls, Fig. 3. Ditcher Tucket Equipment for Key-stone Excavator. Sl®(2l(llS CsUffiCll ^ftlPOCSft Proportioning Gravel Concrete: Quan-tity and Cost Curves
Engineering and Contracting . mains, is good for a width of 15 ins. to 44 ins., anda depth of t! or 8 ft. The best record withthis type of scoop was made by S. B. of Woodlawn, Pa., on work atConway, Pa. He dug in eight hours 4u(l ft. ofi) ins. :md is ofthe inverted porcupine style. The engine is8x8 ins. The weight of the complete machine is about lbs. The machine is made bythe Keystone Driller Co., Beaver Falls, Fig. 3. Ditcher Tucket Equipment for Key-stone Excavator. Sl®(2l(llS CsUffiCll ^ftlPOCSft Proportioning Gravel Concrete: Quan-tity and Cost Curves. In pri pMrtioning the material for concreteriiiU anil concrete waterways it is necessary at the aggregate be carefully proportioned? secure a maximum density. The importance• I securing maximum density is self-evidentI engineers engaged in building concrete ads, the wearing qualities of which bear ainite relation to the density of the concrete. While clean, hard gravel is generally ac- Ited as a superior material lor concrete, is undoubtedly a wide variation in thequality of the mixture produced. This is duein a large measure to uncertain proportioning :)sequcnt on the use of pit run aggregate. our issue Feb. 14, 191^, we gave a methodof accurately proportioning the aggregate,illustrated by various curves developed byClifford Older, bridge engineer, Illinois High-way Commission, and the present article is adevelopment and elab
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