from a trigonometrical survey under the direction of A.D. Bache, Superintendent of the Survey of the Coast of the United States ; triangulation by C.M. Eakin, Assistant ; topography by J.B. Glück, Assist. ; hydrography by the parties under the command of Lieuts. Comdg. C.H. McBlair & C.R.P Rodgers, U.S.N. Assistants ; redd. drng. by L. Dazer & L.S. Williams ; engd. by E. Yeager, J.L. Hazzard & App. S.W. Bradley