733 



INDEX. 



Petroleum balloons, 94 

 Photo-chemistry, 7 

 Photo-electric microscope, 247 

 Photography, 7, 289297 

 Photographic microscope, 325 

 Photography ; on paper, collodion, and 



glass, 298312 ; with artificial light, 307; 



its application to arts and sciences, 323 ; 



use of the electric light, 689 ; registering 



meteorological observations, 723 

 Photolithography, 313-329 

 Photomicrography, M. Girard on, 310 

 Pianofortes, 120, 138, 161166 

 Pictet's ice making process, 388 

 Pigeon-post during the siege of Paris, 100, 



311 



Pile-drivers, hand and mechanical, 19 

 Pipette, 47 



Pixii's magneto-electric machine, 661 

 Placet's process of heliography, 319 

 Planets, telescopic views of Jupiter and 



Mars, 275 

 Plante's improvements in electro typing, 



710 ; electro-silvering, 715 

 Ploughing-machines, steam, 485, 486 

 Plumb-line and levels, 17 

 Pneumatic machines. 63 

 Pneumatic tube, 4, 78 

 Poitevin's carbon process for printing 



photographic proofs, 314 ; chromo-helio- 



graphy, 322 

 Poles, telegraph, 607 

 Porcelain stoves, 3.48 

 Porta, the inventor of the camera obscura, 



289 



Portable engines, 484 

 Postage-stamps printed from electro-types, 



708 



Pouillet's chronoscope, 649 

 " Power" of steam-engines, 433 ; (and see 



" Horse -power ") 



Pressure-gauges of steam-boilers, 403 

 Printing photographic proofs, 314 

 Printing-machines, stearn, 491 

 Printing electric telegraphs, 548, 583 



597 

 Projectiles, their velocity measured and 



recorded, 649 

 " Proof-spirit," 40 

 Propulsion of ships ; wheels, paddles, 



screw propeller, 448, 450 

 Pseudoscope, 286 

 "Puffing Billy," the oldest locomotive 



engine, 462 



Pulsation registered by photography, 311 

 Pulsilogium, invented by Galileo, 23 

 Pulvermacher's chain, galvanic, 719 

 Pumps, 51, 72 ; steam, 484 



Quiute:i7 balance, 30 



B. 



Railways, early history of, 461 ; statistics 

 of their extent, 499 



Railway telegraphy, 566 



Ramsbottom's engine-pistons, 413 



Raspail's microscope, 237 



Ratel's improvements in photography, 297 



Reed instruments, 171 



"Receivers," in printing telegraphs, 595, 

 618 



Reflecting instruments ; mirrors, 201 ; 

 sextants, 206 ; goniometers, 209 ; helio- 

 stat and siderostat, 212, 216 



Reflecting or catoptric lighthouses, 221 



Reflecting telescopes, 263 



Reflecting and refracting stereoscopes, 281, 

 283 



Refracting or dioptric lighthouses, 222 



Refracting telescopes, 249 



Regulators of steam-engines, 422 



Regulators, electric, 634 



Regulators of electric lamps, 673 ; Serrin's, 

 685 



Reiser's electric telegraph, 544 



Relays attached to electric telegraphy, 578, 

 579 



Renard, Leon, on lighthouses, 221 



Rennie's disc rotatory steam-engine, 431 



Rheo- electric machines, 721 



Ribbon-paper for printing telegraphs, 593 



Ribourt's compressed-air locomotives, 476 



Rimini, Val terms de, ancient paddle- 

 wheels, 448 



Ritchie's discoveries in electric telegraphy, 

 545 ; electric regulator, 637 



Road-locomotives, 461, 477 



Road-locomotion, future of, 481 



Roberval's balance, 32 



" Rocket," George Stevenson's locomotive- 

 engine, 462 



Roman foculus, 335 



Ronald's electric telegraph 544 



Roseleur's balance for electro-plating, 713 



Rosse, Lord, reflecting telescope, 265, 268 ; 

 heat of the moon's rays, 36i) 



Rotating electro motors, 652 



Rotation of the earth proved by deviation 

 of the pendulum, 26 



Rotatory pumps, 56 



Rotatory steam-engine, 430, 432 



Rowing wheels, used for propelling ships, 

 448 



Roux, M., electro-magnetic machines, 681 ; 

 electro-medical apparatus, 721 



Rozier, Pilatre de, his aerial voyages ; fatal 

 result, 90 



Ruhmkorff's induction coil, 693 ; electro- 

 medical apparatus, 721 



Rumford, Count, on fire and fire-places, 

 341 ; fabrics as heat-conductors, 360 



Ruolz, M. de, improvements in electro- 

 plating, 7C4, 711. 



Russian stoves, 347 



Ruth ven's hydraulic propeller, 450 



