International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 703
rming any anglewith it. The table is supported by a pivot under its cen-ter, and by wheels or rollers under its ends. Beneath theplatform is excavated a circular pit 4 or 5 feet deep, havingits circumference lined with brick or stone masonry 2 feetin depth, and capped with either cut stone or wood.…
Railroad engineering
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