| editor, The Biographical Dictionary of America… (1906)
“ He then studied law, but did not practise, devoting himself to scientific investigation and study. As topographical engineer of Maryland, to which office he was appointed in 1834, he made a survey of the state in connection with the geological survey, and prepared the annual reports until 1841. These reports prompted the opening of valuable coal and iron mines. He was an authority on standards of weight and measure, and was associated with Superintendents Hassler and Bache of the coast survey. ”
