304                                  GENERAL  INDEX.
Sails, 346 ; Adjustable Superposed, 163 ; Screw-like, 65 ; Parachute-like,
116.
" Sainted Screw," 53-
St. Peter, 77, 78.       o     t      _
Sanderval, M. de, 158, 261 ; Experiments by, 159, 160, 161.
Sand-glass, 325.
San Diego, 263.
San Francisco, 130 ; Newsletter, 130.
Saracen, 80, 81.
Sarti, 50.
Science of the Bird, 76, 81, 83, 153, 208.
Scientific, American, 193 ', American Supplement, 187; Congress at Toulouse,
69.
Screw, Apparatus, 73 ; Archimedean, 49 ; Axis of, 114 ; Best, 65, 71 ; Blades,
220 ; Blades, Best Form of, 112; Carlingford, 89 ; Concave, 58 ; Double, 56,
60, 61 ; Double-vaned, 117 ; Efficiency of, 71 ; Flying, 55, 56, 57, 66, 117,
119 ; Screw-like Sail*-, 65 ; Machine, 64 ; Machine, Hovering, 215 ; Parachute,
60 ; Pitch of, 59 ; Propellers, 65, 113, 129, 131, 252, 253 ; Propulsion, 220 ;
Push of, 233, 335 ; Sustaining, 58 ; 1 hrust of, 71, 244, 245, 246 ; Two-blad-
ed, 71 ; Vanes, 125 ; Water, 67 ; ** With Variable Pitch," 59.
Screws, 11, 35, 62, 215, 239 ; Aerial, 38, 49, 51, 52, 53, 54, 57, 60, 64, 69, 70, 89,
125, 225, 247, 253 ; Aerial, Action of, 68 ; Aerial, Best Pitch of, 69 ; Aerial,
Experiments in, 71 ; Aerial, Know Little About Them, 72 ; Aerial, True
Function of, 72 ; Double-bladed, 62 ; Efficiency of, 65, 66, 71, 233 ; Fee-
ble, 274 ; Lifting, 66, 116 ; Lifting and Driving, 111 ; Lifting Power of,
64 ; Marine, 69, 72 ; Propelling, 153 ; Rotating, 72, 87, 178, 354» 258 ; Slip
of, 333, 238 ; Spinning, 56 ; Superposed, 28, 49, 137 ; Superposed Aeiial,
217, 218 ; Tests of, 71 ; to Lift and Propel, 48, 142 ; Vertical, 50, 66.
Sea, no : Anchor, 275 ; Birds, 148,202,203; Gulls, 235, 273 ; Pie, Power of,
40 ; Waves, 227.
Secretary of French Aeronautical Society, 59.
Seguin, M. Marc, xx6.
Seine, 13.
Self-generating Steam Boiler, 63.
Sénécal, M., 131, 132.
** Serpollet" Boiler, 228.
Shape, Most Efficient, 167 ; of Wings of Birds, 157.
Shapes, Experiments in, 167, 168.
Shill, Mr., 126.
Ships, 268.
Shipwreck, 177.
Shipwrecked Mariners, 176,177, 180.
Shoe, Wooden, 105.
Simmons, Mr , 19, 177, 178.
Simon the Magician, 76, 78.
Skate-fish, 144.
Skates, 164, 312.
Skin Friction, 10, 251.
Skye, Experiments of, 5.
Slrep on the Wing, 192, 272.
" Slip," 67 ;  of Screw, 233, 238 ;   of Screw Propeller, 65.
Smeaton's Formulae, 43, 172 ; Table, 126, 209.
Smithsonian History, Natural Museum of, 114.
Smyrna, 197.
Smyth, Dr. W., 39, fix, 112.
Smythies, Mr., 92.
Soar, Learning how to, 161.
Soarers, 191, 197, 202.
Soaring, 72, 96, 208 ; Action, 198 ; Albatross, 106 ; " and its Imitation," 206 ;
Angles of Incidence, 167, 168 ; Apparatus, 151,180, 211, 246, 249 ; Appara-
tus, Cost of, 209 ; Attitude, 167, 169 ; Birds, 16, 72, 75, 76, 77, 78, in, 130,
147, 148, 151, 153, 164, i66< X78, 180, 186, 192, 193, 195, 197, 198, 301, 206,
2x5, 217, 257, 266 ; Birds, Form of, 153 ; Birds, Helical Path of, 160 ; Birds,
Paper on, 197 ; Buzzard, 74 ; Device, of Beeson, 163 : Devices, 260 ; Flight,
95. 96, 98, 130, 149, 200, 203, 204, 205, 207 ; Flight, Problem of, 200 ; Ma-
chine, 82, 214 ; Machines, Designers of, 211 ; Machines, Experiments with,
211 ; Machines, Usefulness of, 211 ; of Aeroplane, 153 ; of Birds, 210 ; Par-
tial Success in, 208 ; Problem, 228 ; Simulation of, 200 ; Theories of, 206 ;
Vulture, 249.