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Side by side training airplane, Spad, French 322 Sights, Aldis, French 457 Bomb, French 370-452 Drift, Cook, recommended purchased 910 French 343 Machine gun, Chretien, French 446 French 363 Ring and bead, French 363 Telescopie, French 363 Silencer apparatus, French 317 Silencers, cleaning of, French 353 Expansion of, French 353 French 353 - 390 - 405 - 407 Head resistance of, French 353 Silver Streak airplanes, British 712 Description of 823 Single-motored bombardment ship, wibault, French 324 Single-seater fighter, low altitude, French 365 Siddeley "Siskin", British 627 Pursuit, Gourdou, French 316 Spad, French 321 Wibault, French 325 Size of drawings, Wibault system, French 420 Skids, deck flying, British 721 Tail, French 339 Sleeping accomodations [accommodations], flying boat, British 720 Slip stream, French 353 Slotted air foil, Handley Page, British 783 Wing, Handley Page, British 707 "snipe"[?], Sopwith, British 736 Societe Duralumin, French 482 Soesterberg Airedrome, Dutch 679 Sopwith "Snipe", British 736 Sound beam airdrome indicator, British 734 Sound-proof radio cabin, Farman "Goliath", French 471 South American Republics, purchase of Ansaldo aircraft, Italian 576 Spacing of drawings, Wibault system, French 420 Spad aircraft, French 321 Italian 507