822 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 55 



Thubstox, Roreet H. Problem of air navigation. 



Forum, Vol. 8 (Jan. 1890), New York, pp. 542-554. (11840 



. Problem of air navigation. 



Reprinted from The Forum for Jan., 1890, pp. 542-554. (11847 



. Steam engine efBciences: The ideal engine compared with the real 



engine. 



Trans. Amer. See. Mech. Eng., Vol. 12, 1891, New York, pp. 729-739, flgs. 228- 

 229. S 11848 



. Theory of the steam jacket; current practice. 



Trans. Amer. Soc. Mech. Eng., Vol. 15, 1894, New York, pp. 779-881, ill. S (11849 



. The " Series-Vapor " and " Heat-Waste " engines, as supplementary to 



single vapor engines. 



Journ. Frankl. Inst. (Oct.-Dec. 1902), Philadelphia, pp. 1-80, ill. S (11850 



TiFEBNATi, Giuseppe Donini. Saggio aeronautico. 



Firenze, 1819, 8°, pp. 92, pis. 4. (11851 



TiLLO, Alexis de. Magnetic survey of Europe and Asia. 



Rep. Int. Meteor. Congr., No. 11, Part 2, 1895, Washington, D. C, pp. 465-469, 

 pi. 14. S (11852 



Tllt. Aeronautical bad language. 



Flight, Vol. 1, No. 11 (March 13, 1909), London, p. 148. S 



Tilt and dip. Terms used in " Flight." 



Flight, Vol. 1, No. 8 (Feb. 20, 1909), London, p. 104. S 



Tipfel. Die Forderung der Gleitflugproblems. 



111. Aer. Mitt., X Jahrg., 6 Heft (Juni 1906), Strassburg, pp. 209-210. S (1185S 



Tippel, C. R. Zur Flugtechnik. 



111. Aer. Mitt., XU Jahrg., 19 Heft (Sept. 1908), Berlin, pp. 567-568. WB (11854 



Tibauo, a.; Saxchez y J. Gakcia Rouke, Aerostacion militar. 



Madrid, 1889, 8', pp. 101, flgs. 41. (11855 



, Memorial de Ingenieros de Ejerceto. 



Madrid, 3a 6poca, T. VI. (llS55a 



TissANDiEE. See 3987, 12189. 



. Aerostat dirigeable a helice. 



La Nature, T. 12, 2, 1884, Paris, p. 273; Lea Mondes III, T. 9, 1884, Paris, p. 

 156. (11856 



. Aerostat electrique. 



Bull. Soc. Enc. T. 83, 1884, Paris, p. 140. (11857 



. Aerostat Electrique Tissandier. 



Les Mondes HI, 1883, Paris, p. 336; Le Chron. Ind., T. 6, 1883, Paris, p. 532; 

 La Liim. Elect., T. 2, 1883, Paris, p. 84; La Nature, T. 2, 1883, Paris, p. 326. (11858 



