International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 593
their being heaved by hard freezing. In exposed localities,where the freezing is more severe, it may be necessary toexcavate the foundation trenches to a depth of 2 feet. It is bad policy to use irregularly shaped stone, especiallycobble stone, in building trestle foundations. The continualjar…
Railroad engineering
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