Wadsworth, Capt. Decius: on Whitney’s interchangeable system, 134-135. Waldo, Daniel: Hope Furnace, 117. Wallace, William: 237. Wallace & Sons: 234. Waltham Watch Works, see American Watch Co. Warner, Worcester R.: 183, 262, 263. Warner & Swasey Co.: 261-265; building of astronomical instruments, 263-264. Washburn, Ichabod: American Steel & Wire Co., 225, 226. Washburn & Moen Co.: 225. Waterbury Brass Co.: 234, 237. Waterbury Button Co.: 234. Waterbury Clock & Watch Co.: 234. Waters, Asa: 226. Waston, William: Nasmyth on, 84. Watt, James: 3, 6, 82, 83, 150, 161; invention of steam engine, 1, 2, 145; parallel motion, 3 note 6; dependence on Wilkinson’s boring machine, 3; opposed by Bramah, 18. Weed Sewing Machine Co.: 170, 174, 175. Weeden, W. N.: 237. Wheeler, William A.: 221. Wheeler & Wilson: 192. Whipple, Cullen: 126. Whitcomb, Carter, Co.: 222. Whitcomb-Blaisdell Machine Tool Co.: 222. White, Zebulon: J. S. White & Co., 122. White Sewing Machine Co.: 193, 266. Whitman-Barnes Co.: 266. Whitney, Amos: 137, 170, 177, 219. Whitney, Baxter D.: 177, 230. Whitney, Eli: 6, 146-147, 161, 177; interchangeable system, 76, 132-133, 134-135, 136, 145, 146, 158-159; cotton gin, 114, 131, 145, 148-158; U. S. contract of 1798, 131-132, 158, 159; Whitneyville plant, 132, 162, 158, 160; method of manufacture, 158-159; milling machine, 142; Miller & Whitney, 149. Whitney, Eli, Jr.: contract for “Harper’s Ferry” rifle, 160; steel-barreled muskets, 160, 162. Whitney Arms Co.: 160-161; first Colt revolvers made by, 167. Whitworth, Joseph: 7, 8, 9, 93; Chapter IX; screw-thread practice, 10, 59, 101, 102 note 105; manufacture of plane surfaces, 44, 45, 98-101; with Maudslay, 46, 98; shaper and improvements in machine tools, 99; improved methods of measurement, 101; ordnance and armor, 104-105; on American automatic machinery, 102-104; William Armstrong, 105. Wilcox & Gibbs Sewing Machines: 208, 210, 213. Wilkinson, Abraham: 119. Wilkinson, Daniel: 119, 122. Wilkinson, David: 123, 124, 125; patent on slide-rest, 6; steamboat, 119; slide lathe, 119-120; textile machinery, 122; nail manufacture, 122. Wilkinson, Isaac: 119, 125. Wilkinson, John: 2, 8, 11, 15; boring machine, 3, 10, 11, 12, 13, 60; first iron boat, 14; first iron bridge, 15; relations with Boulton & Watt, 12, 13. Wilkinson, Ozeal: 118-119, 121, 122. Wilkinson, William: 119, 121. Willimantic Linen Co.: 175, 178. Willis, Robert: 69 note 64; gear teeth, 63, 64, 69-70. Wilmot, S. R.: micrometer, 212. Winchendon, Mass.: woodworking machinery, 230. Winchester Repeating Arms Co.: 160, 174. Windsor, Vt.: 127, 186. Windsor Machine Co.: Gridley automatic lathes, 194, 200. Windsor Manufacturing Co.: 193. Wolcott, Oliver: 132. Wolcottville Brass Co.: 233-234.