NO. 3 JLNDEX. 317 



PAGE 



Pressure-gauge lit 



Prony-brake 38, 61, 65, 66, 117, 179, 222, 228, 233, 249 



Propellers 7, S, 11, 13, 22, 40, OS, 69, 94, 95, 102, L03, L08, 109, 118, L19, L36, LI ' L49, 



L78-184, 258, 261, 272, -'77 



construction of 63, 7';. 98, 100, L78 184 



early forms of 7, 8, 11, 22 



lift of 61, 62, 66, 69, 77. 94, 102, 105, L07, L31, lis, 151, 189, 



pitch of 63, 69, 76, lis, I s l 



position of 39, 63 



shafts of 39, 117, 17.7-177, 242 



slip of L07 



speed of (see also revolutions per minute i 61,91,94,99, 107, 111. 134, 264,272 



tests of (see pendulum, lift, and thrust ). 



thrust of 47, 02, 94, 119, 148, 154, 161, 171 



toy 7. s, !i, 21, 22 



Pumps 36, 37, 57, 59, 65, 68, 71. 7.7. Ill, 115, 141, 241 



centrifugal 211. 2 is 



circulating 114, 244 



double-acting 68, 114 



force 57 



Q 



Quantico, Va., flights at 64, 00, 79, 93, 147. 255, 269 



Quarter-size model 158, 159. 170. 220-23::, 2!:;. 255 61, 281 



Quill, eagle's, and spruce rib compared 200, 201 



R 



Radiator (see also engine, water-cooled) 252 



Randolph, Gen. W. F 276, 277 



Record of nights (see also data sheets) 2, 3, 17, 107, 117, 135-155, 255-282 



Reed, R. L„ chief carpenter 93-95, 102, 106, 200, 271, 272, 275 



Reel attached to float 119, 120 



Relation of area to weight and power 43, 44, 64, 81, 89, '.' 



Reservoir (see air-chamber and tank). 



Resistance, air 6, 8, 9, 



of frame and guy wires '• 165-107 



Revolutions of engine and propellers per minute {tee also speed) 3.3, S8, 63, 65, 66, 102, 109, 11"., 



249, 27,2 



Rib, spruce, and eagle's quill, comparative strength of 200, 201 



Ribs, construction of 37, 80, SI. SO. 89, 188, 191-200. 26: 



Ridgway, Robert, on American Buzzard > 



Root-angle of wings 82, 83, 91, 98, LOO, L01 



Rotation, angle of ' ' 



center of 02 



Rubber as a source of power 5, 8-24, 



elastic limit of 9, 2: 



" fatigue " of 23 



horse-power produced by 9, 22, 2:'. 



springs 2, 



insulation 144, 211 



Rubber-driven models 5, x 



Rubber-pull and rubber-twisted models 16-24 



Rudder (see also tail) 8, 9, 77. 80-91, 122, 136, 207-217, 255. 272. 275 



horizontal 



Penaud's, 8, 12, 13, 50, 79, 87, 107, 122, 139-147, 151, 209, 211, 213, 214, 216, 253, 270-272, 275 



vertical, evolution of 81, 82, 86, 97, 101, 



Rudder-tail (see tail-rudder). 



S 



Sanding-tests of wings 84, 85. 89, 99. 190-204 



" Separator," evolution of, for dry steam 58, 59, 65, 68, I I I, 112 



Serpollet-type boilers 



Shafts, main, construction of H" 



propeller 39, 117, 175-177, 242 



