Veneer construction, 23, 209, 211 Venturi tube, 132, 142, 144 Vibration, 16, 18, 26, 40, 41, 58, 102, 179 Volcanoes, photography of, 15, 399 Water for mixing chemicals, 262 Watkins factor, 258 Weight and head resistance, equivalence, 156 of film compared to plates, 101, 130 of deRam camera, 123 of hand cameras, 96 of K type camera, 144 of K film roll, 144 of L type camera, 117 of M type camera, 109 of storage batteries, 157 Wind, flying against, 68, 308 motor, 146 Windows in side of plane, 214, 328 Wire, barbed, appearance of in aerial photograph, 360 * * * * * * Transcriber's note: 1. Silently corrected typographical errors. 2. Retained anachronistic and non-standard spellings as printed.