840 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 55 



TwixiAG, E. W. Model aeroplanes; how to build and fly them. 



London. 



Twining, H. la V. The flying and soaring of birds explained by well-known 

 mechanical principles. Presents results of experiments and observation 

 explaining the fundamental principles. Diagrams. 



Scient. Amer. SiippL, Vol. 61, No. 1383 (May 5, 1906), New York, pp. 25368- 

 25370, figs. 8. S (12113 



Twin screw dirigible of Capt. Baldwin. 



Aeronautics, VoL 2, No. 3, 1908, New York, pp. 25-26, ilL S (12114 



Two hundred thousand dollars in prizes for airships. 



Scient. Amer., Vol. 86, No. 5 (Feb. 1, 1902), New York, p. 69. S (12115 



Two remarkable aeroplane flights. 



Pop. Mech., Vol. 10, No. 8, 1908, Chicago, p. 525. S (12116 



Tybusch, G. Die Luftballons der Loire-Armee. 



1872, 8°, pp. 8. • (12117 



Tygakd, James Wallace. Airship engines. 



American Aeronaut, Vol. 1, No. 4, 1908, St. Louis, pp. 123-127. S (12118 



TzERTELEFF, D. La logique de la navigation aerienne. 



L'Afironaute, 34'= annee. No. 1 (Jan. 1901), Paris, pp. 10-16. S (12119 



Uebelackers Abhandlung liber die Luftkugeln, wodurch erwiesen wird, dass 

 ein deutscher Physiker, Albertus de Saxonia, vom XIV. Jahrhunderte d. 

 Urheber derselben sei. 



1784, 8°, pp. 16, 30, pi. 1. (12120 



Uebeb das Schiefsen auf Ballons. 



Schweiz. Mil. Blatt., 1895, pp. 463. (12121 



Ueber das Schiessen gegen Luftballons. 



Schweizerische Zeitschrift fiir Artillerie und Genie, Band XXIV, 1888, Frauenfeld, 

 p. 2L (12 J 23 



Ueber den Blitzschlag in den Fessel-Ballon zu Aldershot. 



Zeitschr. Luftsch., XIII Jahrg., 10 Heft, 1804, Berlin, pp. 276-277. S (12123 



Ueber den Canal la Manche. London — Paris in sechs Stunden. (Jacques 

 Faure, Ballon " I'Aero-Club Nr. II.") 



Wien. Luftsch. Zeit., IV Jahrg., Nr. 3 (Marz 1905), Wien, pp. 49-50. S (12124 



UciJER den Stand der Luftschiffahrt in Schweden. 



111. Aer. Mitt., Nr. 3 (Juli 1900), Strassburg, p. 82. S (12125 



Ueuek den Ursprung der Luftballe. 



Quart. Journ. Sci. Lit. Art, Vol. 1, 1828, London, p. 29. (12126 



Ueber den Zeppelin-Ballon. 



Wien. Luftsch. Zeit., VII Jahrg., Nr. 3 (Marz 1908), Wien, pp. 49-50. S (12127 



