Utilization of the æther, 284 V Various kinds of resistance to a body moving through a fluid, 68 Velocity of electric radiation, 249 —— of light, 189 —— of sea waves, rule for calculating the, 10 —— of sound, how affected by temperature, 117 —— —— in different gases, 126 —— ——, influence of specific heats upon the, 119 —— ——, measurements of the, 116 —— ——, theoretical determination of the, 118 —— of sound wave, 115 —— of waves in water, air, and æther compared, 283 Vernon Boys, Professor, instructions by, for making soap solution, 144 Vibration rates of musical tones, 160 —— —— of various æther waves, 252 Vibrations, forced, 149 ——, free, 149 —— giving rise to musical tones, 160 Vincent, Mr. J. H., 51 Violin, improved by Mr. Augustus Stroh, 179 Violin, structure of, 177, 178 Viscosity of liquids, 58 Vortex motion, 59 —— ring in air, 61 —— ——, production of, in air, 61 W Wave amplitude, definition of, 8 ——, causes of breaking, 29 ——, electric, nature of an, 185 —— frequency, 8 ——, gravitation, 40 —— group, velocity of a, 20 —— length, 7 —— lengths of various kinds of æther waves, 257 ——, longitudinal, 7 —— motion, 2 —— ——, definition of, 4 —— —— model, 5 —— ——, model for illustrating, 13, 14 —— ——, various kinds of, 4 —— produced in a canal, 33 ——, reflection of a, 55, 56 —— resistance, 68 Waves, 1 —— and ripples in the æther, 232 ——, conditions of, for interference of, 49, 50 ——, electric, 185 ——, interference of, 48 —— in the air, 103 —— made by canal-boats, experiments on, 101, 102 —— made by ships, 57, 58 —— on a snow surface, 31 —— on clouds, 30 —— produced by high-speed ships, 79 ——, refraction of, 52, 53 ——, sea, 2 ——, stationary, 155 —— train, 20 —— ——, velocity of, 20 ——, transverse, 7 —— velocity, a rule for determining, 9 Wind, influence of, upon distances at which sounds are heard, 120, 121, 122 Wireless telegraphy across the Atlantic, 280 —— ——, apparatus for, 267 —— ——, explanation of, 273 —— ——, Marconi’s system of, 269 —— ——, method of conducting, 274 —— ——, transmitter for, 271 —— ——, utility of, 281 Worthington, Professor, photographs of splash of drop, 16, 17 Y Yacht-design, object of, 96 Yachts entered for the America Cup race, pictures of, 94, 95 Young, Dr. Thomas, investigations of, on interference of light, 190 THE END. PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES. ————————————————— End of Book ————————————————— Transcriber’s Note (continued) Errors in punctuation and simple typos have been corrected without note. Variations in spelling, hyphenation, accents, etc., have been left as they appear in the original publication unless as stated in the following: