- William Petit Trowbridge was an 1848 graduate of the U.S. Military Academy who, while employed by the U.S. Coast Survey, worked to develop improved methods for determining the speed of a ship and the distance to the sea bottom. This log came from Columbia University where Trowbridge served as professor of engineering in the years 1877-1892. Although the instrument is not signed, the box is marked "Ship’s Log and Sounding Instrument Combined. Devised by W. P. Trowbridge in 1863".
- Currently not on view
- overall: 7 1/8 in x 15 1/4 in x 7 1/2 in; 18.0975 cm x 38.735 cm x 19.05 cm
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- National Museum of American History