A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
River operations in the Pittsburgh district
Sand and gravel are secured by dredging from Ohio and Allegheny rivers; all-steel, electric dredge; completely electrically driven, all units being connected to individual motors; average production of sand is about 12,000 tons per week; proportion of sand to aggregate is approximately 30 per cent.
River operations in the Pittsburgh district
Sand and gravel are secured by dredging from Ohio and Allegheny rivers; all-steel, electric dredge; completely electrically driven, all units being connected to individual motors; average production of sand is about 12,000 tons per week; proportion of sand to aggregate is approximately 30 per cent.
River operations in the Pittsburgh district
Nat. Sand Gravel Bul
Davison, J.K. (author)
1928
5 pages
3 Figs.
Article (Journal)
English
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