/ 



SCS.^jZ, 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 0/ Nature trusts the mhui which builds for a/c."— Worus^'ORTH. 



.\o. 1649, Vol. 64] 



THURSDAY, JUNE 6, 1901. 



ered as a Newspaper at the General Post OlTic 



[Price Sixpence. 



[All Rights are Reserved. 



WIRELESS TELEGRAPHY 



IN THE BRITISH NAVY. 



irhe Admiraltv have adopted the " APPS- 

 NEWTON' INDUCTION COILS as the 

 standard pattern for Wireless Telegraphy 



in the British Navy, and a large number 



if Coils and Transmitters are now being 



;■ Mi^tructed for use on H.M. Ships at the 



London Workshops of 



I NEWTON & CO., 3 FLEET ST. 



The " APPS-NEWTON ' INDUCTION 

 ICOILS are unequalled for \A/ireless Tele- 

 leraphy and X-Rav work, and are used 

 by alf the principal Military, Naval and 

 "bmmercial exiTerts in Wireless Tele- 

 graphy as well as in Radiography. 



A NEW 



LENS 



FOR ALL 



WORK. 



,V*^ In 3 Series. •^Tj 



'4dL» I. GENER.4L. O^. 



^J* II. CONVKRTIBLE. ^Kf 



^^ III. sFi-:ci.\i. rijorpr^. ^^ 



■" iniiiiii!-'---i^-:iiiJi!i ^ 



i 



NEWTON & CO., 



FLEET STREET, LONDON. 



DEMONSTRATION BALANCE 



PHYSICAL I 

 EXPERIMENTS. 



Specially designed to 

 show the principles under- 

 lying the construction of 

 llie Balance. 



£7:7:0 



FULL PARTICULARS ON 

 APPLICATION. 



JOHN J. GRIFFIN & SONS, l^ 



20-26 SARDINIA ST., LINCOLN'S INN. W.C. 



This rapid, wide, medium ur iiarnnv angle lens all in one is 



suitable for all work. 



Full Ciitalopie free on applicnUon to the Manufacturers : — 



R. «Sc «J. se:ck;, Ltd., 



68 CORNHILL, LONDON, E.G. 



NEGRETTI & ZAMBRA'S 



IMPROVED 



SELF-RECORDING RAIN- 

 GAUGES, BAROMETERS & 

 THERMOMETERS, 



Giving continuous Records 



on Cliarts whicli only require 



changing weekly, 



Invaluable to Invalids and 



others unable to take daily 



readings. 



Illustrated Price List of Instruments free by Post to all 

 parts of the World. 



NEGRETTI & ZAMBRA, 

 38 HOLBORN VIADUCT, EC. 



P.RANCHF.;- 4S CORNHII.I,. a.1,1 ,.3 RECENT STREET. 

 AWARDED TWO GOLD MEDALS PARIS EXHIBITION 1900 



