Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 438
ed inward, to save ma-terial while giving a broad base; their length is 12 feet. After the blocks are set, the vertical chain-grooves in eachblock, coming opposite to each other, are filled in with concretein bags, well rammed into place. This closes the joints betweenthe blocks, and also acts as a… … Fig. 1011. As soon as the base-blocks are set, and the groove filled in,the cross-caps resting on the tops of the vertical piles, and onthe longitudinal caps of the bracing piles, reaching about halfway across the base-blocks, are placed and fastened. Oak treenails are used in all fast-enings. The…
Mechanical drawing
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