Part 4

Ibid., p. 166.

James M. Swank, History of the manufacture of iron in all ages..., Philadelphia, 1892, pp. 390, 393.

Country Gentleman, 1857, vol. 10, p. 129.

Reports on spark test by E. A. Battison, U. S. National Museum, and on metallurgical investigation by A. H. Valentine, Metallographic Laboratory of the Bethlehem Steel Company's Sparrows Point Plant.

For this information I am indebted to Mr. E. A. Battison of the U. S. National Museum staff.

Abraham Rees, The cyclopaedia; or universal dictionary of arts, sciences, and literature, Philadelphia, 1810-1842, vol. 33, under saw.