International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 308
re, 25.13 feet. The number of stones in an arch should always be an odd number, which will place the keystone in the center of the RAILROAD CONSTRUCTION. 897 arch and give an equal number of arch stones on both sidesof the key. If now we make the thickness of the archstones 12 inches from center to… … thickness F G oi the abutments at spring line we find byapplying formula 105, Art. 1470. TJiickncss of abut- _ radius in feet rise in feet 10 i-2 feet. ment at sjyring line infeet, 70 hen It eight ofabntnient does not ex-ceed 1\ times its base J Substituting given dimensions, we have thickness of…
Railroad engineering
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