IX. History of launching apparatus and field trials of aerodromes 4, 5, and 6 … 92 1892 … 92 1893 … 93 Field trials … 93 1894 … 96 1895 … 101 1896 … 106 X. Description of the launching apparatus of aerodromes Nos. 5 and 6 … 110 Description of Aerodrome No. 5 … 111 Description of Aerodrome No. 6 … 120 PART II I. Introductory … 123 II. General considerations … 128 III. Experiments with models … 133 Condensed record of flights of aerodromes Nos. 5 and 6, from June 7 to August 3, 1899 … 135 June 7--aerodrome No. 6 … 135 June 13--aerodrome No. 6 … 137 June 22--aerodrome No. 6 … 139 June 23--aerodrome No. 6 … 140 June 27--aerodrome No. 5 … 140 June 30--aerodrome No. 5 … 141 July 1 to July 8 … 142 July 11 to July 14--aerodrome No. 5 … 143 July 19--aerodrome No. 5 … 144 July 27--aerodrome No. 6 … 145 July 28--aerodrome No. 6 … 146 July 29--aerodrome No. 5 … 147 August 1--aerodrome No. 5 … 148 August 3--aerodrome No. 5 … 149 IV. House-boat and launching apparatus … 156 V. Construction of frame of large aerodrome … 164 Transverse frame … 174 Propellers … 178 Aviator’s car … 185 VI. Construction of supporting surfaces … 188 VII. Equilibrium and control … 207 VIII. The experimental engine … 218 IX. The quarter-size model aerodrome … 226 X. Construction and tests of the large engine … 234 XI. Shop tests of the aerodrome … 251 XII. Field trials in 1903 … 255 Statement made by Mr. Manly to associated press … 266 Report of War Department, January, 1904 … 276 Langley aerodrome, Official Report of Board of Ordnance, October, 1904 … 278 Statement to the Press … 280 Present status of the work … 281 Blériot Machine of 1907 on Langley type … 283 Appendix. Study of American Buzzard and “John Crow” … 285 Instructions to assistants … 294 Data sheets 1 to 12 … 297 Index … 309 LIST OF PLATES 1. Rubber-motor model aerodromes Nos. 11, 13, 14, 15, 26, 30, 31 … 16 2. Rubber-motor model aerodromes Nos. 11, 13, 14 … 16 3. Rubber-motor model aerodromes Nos. 15, 24 … 16 4. Rubber-motor model aerodrome No. 26 … 16 5. Rubber-pull model aerodrome … 24 6. Rubber-pull model aerodrome … 24 7. Rubber-pull model aerodrome … 24 8. Rubber-pull model aerodrome … 24 9. Rubber-pull model aerodrome … 24 10. Steel frames of aerodromes Nos. 0, 1, 2, 3, 1891 and 1892 … 33 11. Steel frames of aerodromes Nos. 4, 5, 6, 1893, 1895, and 1896 … 53 12. Burners, aeolipiles, and separators … 56 13. Boilers of aerodromes … 56 14. Aerodrome No. 5, December 3, 1895. Plan view. Rudder removed … 78 15. Aerodrome No. 5, December 3, 1895. Side view … 78 16. Early types of wings and systems of guying … 81 17. Aerodrome No. 5. Plan of wings and system of guying … 89 18. House-boat with overhead launching apparatus, 1896 … 106