It need hardly be said that hydrographic surveys have been of great service to compilers of maps.
In this work the British hydrographic office may justly claim the credit of having contributed the chief share.
Sailing directions for Lake Michigan, Green Bay, and the Strait of Mackinac, U.S. Navy Hydrographic office publication No.
17: Survey of Northern and North-western Lakes, U.S. Lake Survey Office (Detroit, Michigan, 1907); St Lawrence Pilot, 7th ed., Hydrographic Office Admiralty (London, 1906); Effect of Withdrawal of Water from Lake Michigan by the Sanitary District of Chicago, U.S. House of Representatives' Document No.
The same year, however, he began to write a series of articles on naval reform and other subjects, under the title of Scraps from the Lucky-Bag, which attracted much attention; and in 1841 he was placed in charge of the Depot of Charts and Instruments, out of which grew the United States Naval Observatory and the Hydrographic Office.