Airplane engines, 9, 27, 222 air-cooled, 18, 30-31, 35, 38, 44-45, 49, 50-51, 78-80, 119, 134, 147, 188, 196-200, 203, 206, 217-218 commercial, 14 cost and price of, 243-244 early history of, 13-18 government building of, 231-232 Japanese, 193 licensing production of, 232, 239 liquid-cooled, 13-14, 18-19, 30-31, 35, 50-51, 74-75, 78-79, 134, 147, 196-200, 202-203, 217-218 military, 14, 22 precision tools for, 247-248 types of, 12-13, 16-18, 49, 193 variations in, 243 (_See also_ kinds of engines, as Liberty) Airplanes (_see_ Aircraft) Airports and airways, 301 Aktiebolaget Aerotransport, 207 _Akron_, dirigible, 70, 181 _Alabama_, battleship, 25 Alaska, air transportation to, 304 Allison Engineering Company, 197 Allison liquid-cooled engines, 217, 238 Altitude, high, research on, 257 Alvis, Limited, Coventry, 171 Amphibians (_see_ Sikorsky planes) American Airlines, 304 American Export Airlines, 183 American Overseas Airlines, 305, 307 American Society of Mechanical Engineers, 93 Anacostia Naval Air Station, 99, 104 Andrews, Frank, 214 Annapolis, 2, 142, 268 (_See also_ U.S. Naval Academy) Approved Type Certificate (ATC), 176-177 Argentine Navy, 189-190 _Argus_, carrier, 5 _Arkansas_, battleship, 4, 121 _Arklight, The_, 259 Armed forces, 295 procurement for, 66, 187, 232 reorganization of, 290 (_See also_ Army; Navy) Arms Embargo Act, 210, 218, 221-222 repeal of, 222 Army, 19, 25, 35, 41, 58, 72, 147, 290, 292-293 and aircraft industry, 23, 65, 172, 213-216, 243, 262 General Mitchell’s attack on, 58-59 Personnel Procurement Branch, 251 and procurement, 66, 187 war plans effort of, 213-216 war schedule of, 241 Army Air Corps, 196, 203, 214, 216-218, 229, 278, 292 Army Air Service, 9, 23-24, 71, 98, 148 Army Engineering Division, 33, 39, 191, 197 Army-Navy rivalry, 10-11, 24-27, 34, 43, 278, 290-292 Army Ordnance, 24 Army planes, C-54’s, 256 DH’s, 17, 29, 110 F4B’s, 134 Jennys, 14, 43 Lightnings, 257 PT’s, 44 Thunderbolts, 195 (_See also_ kinds of aircraft, as Bombers) Army Reorganization Act of 1921, 213, 233 Arnold, Gen. “Hap,” 213-214, 217 Arnold, Les, 118, 147-148 Arnold, Milton, 294 _Aroostook_, mine planter, 122 ATC (_see_ Approved Type Certificate; Army Transport Command) Atkins, Capt. A. K., 17 Atom bomb, 288, 293, 310 Aunt Lucy, 85-86, 90, 92 Automotive industry, 237 and aircraft engines, 14-16, 238-240, 249 and foreign markets, 205 reconversion in, 272 _Aviation_, 270