Acme Wire Co.: 160. Allen, Ethan: 226. Allen, Walter: 264. Alvord, J. D.: 192, 197. American Brass Co.: 236. American industries: reasons for delayed development, 109-114; influence of the cotton gin, 114. American iron: results of exportation to England, 110-113; early production, 115. American Pin Co.: 234. American Screw Co.: 125, 198, 226; pointed screw, 126. American Steel & Wire Co.: 225-226. “American system”: see Interchangeable manufacture. American Tool Works: 269. American Watch Co.: interchangeable system, 144, 164. American Wire Gauge: 205. Ames Manufacturing Co.: gun-making machinery, etc., 138, 140, 228-229. Amoskeag Manufacturing Co.: 123, 124, 216-217, 253. Andover, Mass.: scythe mill, 117. Angell, William G.: 126. Ansonia Brass & Copper Co.: 234. Ansonia Clock Co.: 234. Arkwright, Sir Richard: 6, 64, 121, 150, 161. Armstrong, Sir William: 105. Arnold, Asa: partner of Pitcher, 124. Arnold, Jeremiah O.: 125. Arnold, Joseph: brother of Jeremiah, 125. Atwood, L. J.: 237. Babbage, Charles: calculating machine, 59. Baldwin, Matthias: Baldwin Locomotive Works, 256. Bancroft, Edward: Bancroft & Sellers, 247. Barber-Coleman Co.: 274. Bardons & Oliver: 183, 265. Barker, William: partner of Lodge, 269-270. Barnes, B. F.: 274. Barnes, W. F. & John, Co.: 273. Barnes Drill Co.: 274. Baush Machine Tool Co.: drilling machines, 230. Bayley, O. W.: 217. Beach, H. L.: 165. Beach, H. B., & Son: 165. Beale, Oscar J.: accurate standards, 205. Beckley, Elias: gun shop, 162. Bellows, E. H.: 222. Bement, Clarence S.: 255. Bement, William B.: 217, 219, 249, 252-254; estimate of, 255; hammer, 255. Bement & Dougherty: 254. Bement, Miles & Co.: history of, 254-255. Benedict, Aaron: brass worker, 232. Benedict & Burnham: 234. Benedict & Coe: brass workers, 232. Bentham Jeremy: 22, 25. Bentham, Sir Samuel: 7, 22, 49, 89, 107; work on Portsmouth block machinery, 8, 9, 18, 22, 26, 28; in Russia, 23, 24; in British navy service, 24; woodworking machinery, 24, 25; planer, 51; patent of 1793, 38; slide-rest, 6, 38; relations with Maudslay, 89. Bessemer, Sir Henry: 96. Besly, Charles H., & Co.: 275. Bibliography: 295-297. Bickford, Henry: 272. Bidwell, Jason A.: 198, 266. Bilgram Machine Works: gear cutting, 259. Billings, Charles E.: 170, 174-175, 201. Billings & Spencer Co.: 175-176. Blake, Eli Whitney: 160. Blake, Philos: 160. Blaisdell, P., & Co.: 222. Blanchard, Thomas: 220-221; lathe for turning gun-stocks, 6, 140, 142, 219, 220-221. Blenkinsop: Locomotives, 56. Block machinery: see Portsmouth block machinery. Bodmer, John George: 75-80; estimate of, 79; diametral pitch, 70 note 66; interchangeable manufacture, 76, 131; firearms, 76; two patents, 77-79;