INDEX. 



741 



V. 



V ail's printing-telegraph, 583 



Valves of balloons, 96, 97 ; of steam- 

 engines, 402, 501 



Van Malderen's electro-magnetic machines, 

 680 



Van Monkhoven's improvements in photo- 

 graphy, 308 



Varley, submarine telegraphy, 616 



Velocity of projectiles, 649 



Venetian mirrors, 203 



Ventilating fire-places, 343 



Verdet on electro-motors, 652 



Verite's electric clock, 639 



Vertical steam-engine, 427, 428 



Villette, his burning-mirror, 365, 366 



Vinegar hydrometers, 38 



Vinometers, 39 



Violins, 119, 138152 



Violoncello, or bass, 148 



Vision in relief ; the stereoscope, 279 



Vocabulary of the Morse telegraph system, 

 582, 619 



Voltaic pile, its application to telegraphic 

 communication, 544 



Voltaire's theory of electricity, 531 



W. 



Walker, Chas. V., F.E.S., Greenwich 

 time-signals, 647 



Walter steam printing-machine, 491 



Waltmann's windlass for anemometers, 724 



Warming, the art of, 333356 



Washbrough, improvements in steam- 

 engines, 444 



Washington, refracting telescope at, 262 



Watches, compensatory action for, 373 



Watchmaker's magnify ing-glass, 235 



Water-coolers, 381 



Waterhouse's process of heliography, 319 



Water-levels, 41 



Watt's steam-engines, 31, 393, 398, 421, 

 423, 425, 430, 435, 440, 443, 454 



Weber, electric telegraphy, 545 



Wedgwood, origin of photography, 290 



Weighing-machines, 30 



Weight, applications of the phenomena 

 and laws of, 3, 14103 



Welsh harp, 159, 160 



Wenham's binocular microscope, 245, 246 



Wheatstone, Sir C. ; reflecting stereoscope, 

 281 ; discoveries in electric telegraphy, 

 545 ; five-needle telegraph, 549 ; single- 

 needle telegraph, 552 ; dial-telegraph, 

 559, 567, 568 ; magneto-alphabetical 

 telegraph, 573 ; patent for printing 

 electric messages, 583 ; automatic high- 

 speed printing-telegraph, 591 ; sub- 

 marine telegraphy, 611, 616 ; chrono- 

 scope, 647 



Wheels for propelling vessels. (See Paddle- 

 wheels, Rowing- wheels. ) 



Whistles, 170 



Whitehouse, improvements in submarine 

 telegraphy, 616 



Wilde's electric light, its application to 

 photography, 307 ; magneto-electric 

 machines, 662 



Wind-instruments, 120, 167180 



Wind-pumps for draining in Holland, 55 



Window-mirrors, 204 



Windows, conductibility of heat by, 358 



Wollaston's goniometer, 209 ; periscopic 

 magnifying glass, 237 ; doublet, 238 



Wolf-note of the violoncello, 148 



Wood as fuel, its use and heating-power, 

 354 



Woodbury's improvements in photography, 

 307 ; in printing photographs, 318 



Wood engravings multiplied by electro- 

 type, 707 



Wool as a heat-conductor, 360 



Wooltf's improvements in steam-engines, 

 444 ; steam-expansion system, 418, 419 



Woolwich, steam-hammer at, 488 



Wright's improvements in electro-plating, 

 704, 711 



Writing telegraphs, 548, 575 



Zinc, electro-plating on, 712 



THE END. 



