61. Aerodrome on launching-car; front wings in place, guy-wires adjusted … 184 62. Details of guy-posts … 184 63. Guy-post and pin on launching-car … 184 64. Experimental type of superposed wings, March 2, 1899 … 192 65. Experimental type of superposed wings, March 2, 1899 … 192 66. Details of ribs and fittings for wings … 200 67. Cross-section of ribs … 201 68. Automatic equilibrium devices … 212 69. Mechanism of control … 212 70. Plan view of quarter-size model aerodrome, June 1, 1900 … 232 71. Plan view of quarter-size model aerodrome … 232 72. End, side, and three-quarter elevations of quarter-size model aerodrome … 232 73. Launching-car with floats … 232 74. Launching-car with floats … 232 75. Quarter-size model aerodrome equipped with superposed surfaces, June 11, 1901. Side view … 232 76. Quarter-size model aerodrome equipped with superposed surfaces, June 11, 1901. End view … 232 77. Cylinders of engine of quarter-size model aerodrome … 233 78. Engine of aerodrome A. Section through cylinder and drum … 236 79. Engine of aerodrome A. End elevation, port side … 236 80. Engine of aerodrome A. Top plan … 236 81. Engine of aerodrome A. Elevation starboard bed plate, sparking mechanism … 236 82. Dynamometer tests of large engine … 248 83. Dynamometer tests of large engine … 248 84. Dynamometer tests of large engine … 248 85. Location of house-boat in center of Potomac River, July 14, 1903 … 256 86. Quarter-size model aerodrome mounted on launching-car … 260 87. Quarter-size model aerodrome in flight, August 8, 1903 … 260 88. Quarter-size model aerodrome in flight, August 8, 1903 … 260 89. Quarter-size model aerodrome in flight, August 8, 1903 … 260 90. Quarter-size model aerodrome in flight, August 8, 1903 … 260 91. Quarter-size model aerodrome in flight, August 8, 1903 … 260 92. Quarter-size model aerodrome in flight, August 8, 1903 … 260 93. Quarter-size model aerodrome at end of flight, August 8, 1903 … 260 94. Hoisting wing of full-size aerodrome … 263 95. Flight of large aerodrome, October 7, 1903 … 266 96. Flight of large aerodrome, October 7, 1903 … 266 97. Aerodrome being recovered, October 7, 1903 … 270 98. Aerodrome in water, October 7, 1903 … 270 99. Aerodrome in water, October 7, 1903 … 270 100. Aerodrome in water, October 7, 1903 … 270 101. Attempted launching of aerodrome, December 8, 1903 … 274 REFERENCES Aerodynamics. ‹See› Langley, S. P. Experiments in Aerodynamics. L’Aéronaute. ‹See› Pénaud, A. Aeronautical Society. ‹See› Harting, P. Aéroplane automoteur. ‹See› Pénaud, A. Balancing of Engines, Steam, Gas, and Petrol. ‹See› Sharp, A. Century Magazine. ‹See› Maxim, H. S. Comptes Rendus, of the Sessions of the Academy of Sciences. ‹See› Langley, S. P. Description du vol méchanique. Encyclopædia Britannica. ‹See› Flight and Flying Machines. Experiments in Aerodynamics. ‹See› Langley, S. P.