Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 447
brought to a uniform level by a solid bed of concrete extending overa greater space than the size of the bottom of the pier by the use of the diving bell. Three guide-piles on each side, and one at each end, were fixed firmly in position. Astrong platform of solid timber, the size of the bottom of… … the level of high water after the caissonwas landed on the bottom. The caissonwas then made water-tight. The bottomwas then floored over with masonry andstone, and laid in mortar up the sides ofthe caisson to the top, thus constituting astone caisson inside of an iron one. Thiswas secured to the…
Mechanical drawing
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