xu. 



KNOWLEDGE, 



S]icct.va 



11, li 



" Reseau Photospherique," Artificial — 



Pliotof^-apli? of the Sun's Siirfare, 

 showing Granule Pattirn 130, 131 



Photographs of Artifieial Solar 

 Granule Pattern 130,131 



Santis, Switzerland, Summit of the 91 



Stars, The Chief Circumpolar, mid- j 



night, April 1, 1900 S'^ 



Stone Implements from West Africa 243 

 Sun, The Constituents of the— 



' Syritta pipiens," The Fly- 

 Female, Male, auil Mouth organs 33 



Himl leg, end of til)ia, antenna, 

 and h^fopygiiuu... ... ... 34 



Claaper and holding organ of Male 35 



Telegraphy, High-Speed- 



Diagrams of the sending and re- 

 eeiving apparatus of the Pollak- 

 Tirag Telegraph... ... ... 195 



Photographie reproduction of an 

 actual message ... 



196 



Telescope, The Great, of Paris, 1900 



The Great Siderostat (full-page 



Photograpliie Plate) 248 



Prineijile of the Siderostat ... 246 



The Great Siderostat of Paris, 

 19O0 (drawing) 247 



Right Ascension and Declination 

 Axes and Circles of Siderostat'.., 248 



The Great Mirror and the Object 

 Glass 248 



General Tiew from the eye-end of 

 the Great Telescope 249 



The Planet Venus, and various 

 Nebula' viewed with the Great 

 Telescope 250,251 



PAOE 



Wireless Telegraphy- 

 Morse's, Preece's, and Willoughby 



Smith's methods of transmission 27,28 

 Diagram of Lodge's Hydraulic 



Model of Leyden Jar .. ... 185 



Lodge's Hydraidic Model of 



Leyden Jar ... ... .. 186 



Lodge's Experiments with Syntonic 



Leyden Jars 232 



Hertz's Oscillator and Resonator... 233 

 Oscillations (various) ... ... 233 



Popoff's Hertzian Wave Receiver 281 

 Long Distance Marconi Transmitter 281 

 Righi Oscillator for use with 



Renector 282 



Marconi Transmitter with Parabolic 



. Redector 282 



Marconi Coherer ... ... ... 282 



Marconi Receiver with Vertical 



Wire and Earth Connection ... 282 

 Marconi Receiver witli Parabolic 



Reflector 283 



Marconi Mast at the South Fore- 

 land 284 



