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Annual Report 1857. No. 72 Tide Gauge For exposed situations off the coastAdapted to Ten fathoms water Devised by H. Mitchell Sub-Assistant U.S.C.S.Tide Gauge Devised for the use of the Coast Survey by Lieut. S. D. TrenchardU.S.N. Assist. U.S.C.S. (Image credit: United States Coast Survey Annual Report 1857)