INDEX 



A, 



Abney, Capt., F.R.S., his process of photo- 

 lithography, 317, 318 

 Achard's electrical brake, 659 

 Achromatic magnifying-glasses and lenses, 



235, 253 

 Acidimeters, 38 

 Acoustics, applications of the phenomena 



and laws of sound, 107 

 Acoustic signals in navigation, 107 

 Aeronautics, 5, 99 

 Aerostat invented by M. Dupuy de Lome, 



101 



African violins, 150 

 Air-guns, 69 

 Air-pumps, 63 

 Air telegraph lines, 607 

 Alarm float in steam-engines, 402 

 Alarums in electro-telegraphy, 565, 574, 



581, 603, 622 



Albaret's road-locomotive, 478 

 Albert Hall, its acoustic arrangements, 117 

 Albert's process of heliograph y, 319 

 Alcohol, distillation of, 378 

 Alcoholometers, 38 

 Alembics for distillation, 377 

 Alexander, his discoveries in electric 



telegraphy, 545 

 Alliance magneto-electric machine, 664, 



680, 689 



Alt-azimuth instrument, 257 

 Alto, viola, or tenor, 148 

 Aluminium, electro-plating on, 712 

 Amati, the (of Cremona), their violins, 119 

 American torpedoes, 698 

 Amici's horizontal microscope, 243, 245 

 Ammonia steam-engine, 504 

 Ampere, on electric telegraphy, 545, 660 

 Andrews, Dr., on magneto-electric 



machines, 660 

 Anemographs, 723 

 Anemometers, 724 

 Annular steam-engine, 457 

 Ansell's fire-damp indicator, 623, 624 

 Anthernius, compound mirrors made by 



him, 367 

 Anthracite, its use and heating power, 354 



Anthropology, photographic illustrations 

 of, 324 



" Apparent light " at Stornoway Bay, 232 



Arachnoidiscus, microscopic photograph of, 

 326 



Arago, on multiple burners applied to light- 

 houses, 225 ; large reflecting telescopes, 

 267 ; labours of Sir W. Herschel, 270 ; 

 photography, 290, 291, 309 ; daguer- 

 reotype, 298 ; early steam-engines, 438, 

 443 ; means of dissipating clouds, 531 ; 

 lightning-conductors, 539 



Archer's employment of collodion in photo- 

 graphy, 302 



Archimedes, inventions ascribed to him, 

 37, 87, 365, 367, 451 



Architecture, application of acoustics to, 

 115 ; photographic representations of, 

 324 



Arch-lute, or theorbo, 153 



Areometers, 37 



Art, application of photography to, 324 



Artesian wells, 44 



Artificial ice, manufacture of, 382 388 



Astronomy illustrated by photography, 

 309, 326 



Astronomical observations, use of the 

 chronograph, 649 



Atmospheric engine, 440 



Atmospheric pressure, in the elevation of 

 water, 50 ; as a motive power on rail- 

 ways, 64, 80 



Aubine's vibrating alarum, 623 



Autographic telegraphs, 548, 597 



Automatic registers in meteorology, 723 



Automatic printing telegraph, Wheat- 

 stone's, 591, 595 



Automatic stewpan, 364 



Autotype process in photography, 299 



Aveling and Porter's traction engine, 481 



I). 



Babinet's reflecting goniometer, 211 

 Boettger's improvements in electro-plating, 



704 

 Bagpipes, 178 



