SOS.'IZ. 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



' ' To the solid ground 

 Of Nature trusts the mind which builds for aye." — WORDSWORTH. 



No. 1 68 1, Vol. 65] 



THURSDAY, JANUARY 16, 1902. 



[Price Sixpence. 



Registered 1 



Newspaper at the Genera! Post Office.] 



[All Rights are Reserved. 



" NEWTONIAN " 

 ETHER SATURATOR. 



This Saturalor will burn with a large bore 

 jet for three hours. £3 O O 



The Editor of "The Optical Magic 

 Lantern Journal" says:— 



<« We were greatly pleased with the be- 

 haviour of this Saturalor, which will be found 

 to work with absolute safety. With it one 

 who had never before used a Saturalor could 

 not fail in getting a good light with practically 

 no trouble. " 



Supplementary List of New Slides and 

 Apparatus Post Free on application. 



NEWTON & CO., 



OPTICIANS BY APPOINTMENT TO 

 H.M. THE KING, 



THE NEW BOOK. 



"PRACTICAL NOTES ON TELFPHOTOGRAPHY." 



50 PAGES, 



BOUND, 



6d. 



50 PAGES, 



BOUND, 



6d. 



THE ABOVE WORK GRATIS ON RECEIPT OF STAMP. 



3 FLEET STREET, LONDON, r. & j. beck, Ltd., 68 CORNHILL, E.G. 



X-RAY TUBES. 



Special arrangement 

 for the 



REGULATION OF THE 



HEAVY DISCHARGE ,, 



TUBES y'^V 



for use with 



ELECTROLYTIC 

 -> . BREAKS. 



Send for our 

 New Price List. 



JOHN J. GRIFFIN & SONS, Ltd., 



20-26 SARDINIA STREET, LINCOLN'S INN FIELDS, 

 LONDON, W.C. 



NEGRETTI & ZAMBRA'S 



TRAVELLER'S SCIENTIFIC COMPANION. 



Aneroid Barometer with Altitude 

 Night .Marching, and Thermome 



cale, Compass with l.uminous Dial for 

 ■ for Air Temperatures (or a Clinical 

 lay be substituted). 



PRICE £4> lOs. to £7 IDs. 



Can also be had Mounted in Gold and Silver Cases. 



Illustrated Price Lists free by Post to all parts of the world. 



38 HOLBORN VIADUCT, E.G. 



Bkanciies-45 CORNHILL: 122 RECENT STREET. 

 AWARDED TWO GOLD MEDALS PARIS EXHIBITION 1900. 



