BIBLIOGRAPHY OF AERONAUTICS — BROCKETT 405 



H£licopt£:ke (L') M. Leger. 



L'Agrophile, IS* annfee, No. 8 (aoOt 1905), Paris, pp. 175-178, ill. 2. S (5880 



H^LicoPTERE Paul Cornu. 



La Conq. I'Air, 5« annfe, No. 8 (avril 1908), Bmxelles, p. 2, ill. 1. S (5881 



Helicopter Jean Bertin. 



Aeronautics, Vol. 2, No. 8, 1908, New York, p. 21, ill. 8 (5882 



Helicopters. -See 8, 593, 765. 1623, 1942, 2173, 2178, 2602, 2642, 2643, 2728, 

 2735, 2736, 2737, 2876, 3073a, 3102, 3103, 3104, 3104a, 3105, 3106, 3109, 

 3110, 3111, 3112, 3756, 3760, 3761, 3764, 3776, 3780, 4004, 4006, 4007, 4008, 4009, 

 4010, 4011, 4012, 4013, 4014, 4015, 4016, 4193a, 4210, 4923, 5575, 5581, 5817, 

 5876, 5877, 5878, 5879, 5880, 5881, 6557, 6721, 6723, 7058, 7139, 7249, 7366, 

 7823, 7824, 7876, 8044, 8148, 8320, 8421, 8706, 9144, 9606, 9741, 10113, 10153, 

 10244, 10264, 11033, 11034, 11754, 12083, 12084, 12231, 12442, 12903, 12904, 

 13079. 



Helios. See 2020, 4268, 10886, 10922, 10934, 10935. 



" Helios," der neue Ballon des " Wiener Aero-Klubs." 



Wien. Luftsch. Zeit., V Jahrg., Nr. 1 (Jan. 1906), Wien, p. 14. S (5883 



Hellmann, G. Contribution to the bibliography of meteorology and terres- 

 trial magnetism in the fifteenth, sixteenth and seventeenth centuries. 



Rep. Int. Meteor. Congr., No. 11, Part 2, 1895, Washington, D C, pp. 352- 

 394. S (5884 



. Die erste Ballonfahrt zu wissenschaftlichen Zwecken. 



Zeitschr. Luftsch., XI Jahrg., 1 Heft, 1892, Berlin, pp. 14-17. S (5885 



. Zur taglichen Periode der Windgeschwindigkeit. 



Meteor. Zeitschr., XVI, 1899, Wien, p. 546. (5886 



Helmeb's system of aerial navigation. 



Scient. Amer. Suppl., Vol. 31, 1891, New York, p. 12543; Electr. Rev., Vol. 18, 

 1891, New York, p. 135. (5887 



Helmholtz. ;Sfee 2208, 4720, 4771, 5888. 



Helmholtz, E. -See 9420. 



Helmholtz, H. von. Considerations theoriques sur les ballons dirigeables par 

 le Professeur H. Helmholtz. 



L'A6ronaute, 7"= annee. No. 7 (juil. 1874), Paris, pp. 203-207. . S (5888 



. Theoretische Betrachtungen iiber lenkbare Luftballons. 



1872-1873 (Verh. d. V. f. Gewerbefl.). (5889 



. Theoretische Betrachtungen iiber lenkbare Luftballons. 



Zeitschr. Luftsch., IV Jahrg., 3 Heft, 1885, Berlin, pp. 65-68. S (5890 



. Ueber atmospharische Bewegungen. 2. Mitth. zur Theorie von Wind 



und Wetter. 



Sitz. Kon. Preuss. Akad. Wiss., Jahrg. 1888, Berlin, pp. 529, 647-663. S (5891 



