J. W. Roe, "English and American Tool Builders" (1916), and J. V. Woodworth, "American Tool Making and Interchangeable Manufacturing" (1911), give general accounts of great American mechanics.

For an account of John Stevens and Robert L. and E. A. Stevens, see George Iles, "Leading American Inventors" (1912); Dwight Goddard, "A Short Story of John Stevens and His Sons" in "Eminent Engineers" (1905), and R. H. Thurston, "The Messrs. Stevens, of Hoboken, as Engineers, Naval Architects and Philanthropists" (1874), "Journal of the Franklin Institute", October, 1874. For Whitney's contribution to machine shop methods, see Olmsted's "Memoir" already cited and Roe and Woodworth, already cited. For Blanchard, see Dwight Goddard, "A Short Story of Thomas Blanchard" in "Eminent Engineers" (1905), and for Samuel Colt, see his own "On the Application of Machinery to the Manufacture of Rotating Chambered-Breech Fire Arms, and Their Peculiarities" (1855), an excerpt from the "Minutes of Proceedings of the Institute of Civil Engineers", vol. XI (1853), and Henry Barnard, "Armsmear; the Home, the Arm, and the Armory of Samuel Colt" (1866).