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Tubing, petro flex, description of, British 871 Steel, distortion of, Fokker, Dutch 684 Welded steel 903 Tubular construction, French 324 Spars, Junkers, German 655 Tulip wood construction, Nieuport 29, French 438 Spad, French 429 Tunnel, wind, British 705 French 413 Issy des Moulineux, experimental chamber of, French 415 Italian 509 Wing, French 327 Turbo compressor, French 332 Turnbuckles, specifications for, French 339 Turn indicator, French 473 Twin-motored type, French 317 Two-seater Spad, French 321 Type specifications, French 380 Italian 519 Ultimatum, May 5, 1921 587 Undercarriage, De Haviland 29, British 770 34, British 772 Short Brothers, British 825 U. S. Navy, see "Navy, U. S." Useful load of Zeppelins, German 635 Use of dirigibles, German 614-630 Usuelli, Italian engineer 517-539 Valves, "Condor" engines, British 750 Meteorological pilot ballons, French 501 Needle, French 351 Oil pressure, French 348 Specifications for, French 340 Variable pitch propellers, British 728 Varnishes, protective, French 336 Varying pressures, British 709 Velocity, high, French 320 Velocity of wind, indication of, British 894