A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



BUY DIRECT FROM 



F.E.BECKER&W«™™£- 



E. LTO-.SUCC'; 



John J. Griffin & Sons, L" 



KINGSWAY, LONDON, W.C. 



Scientific Instrument makers. 



i * (C. V. Bovs's Patent.) ^^ 



, tr^ For Studying Liquid Films, 



Marvellous 

 Colour- 

 combinations 



of Infinite 

 Variety. 



Price 25/- ££&5£ f £S?l|S3j ss Z 



Including 2 Bottles of special Soap Solution and Full Instructions. 



REYNOLDS & BRANSON, Ltd. 



THE "RYSTOS" EDUCATIONAL LANTERN. 



GRAND PRIX, TURIN, 1911. 



With Iron Body (suitable for 

 holes, walnut base, 

 superior quality 2$ 

 pinion. Complete in travelling 



•C" 



etal 



.) with side door and brass sight 

 r 4! in. diameter, objective of 

 , or 12 in. focus, with rack and 

 u without burner ... £5 12 6 

 6 



ip for above ... ... ... ... ,, 2 2 



Lantern fitted with 4J" condenser ,, 10 6 



For Optical Lanterns of other designs, see new catalogue 



of Optical Lanterns and accessory apparatus for 



S. & R. Lanterns post free. 



14 Commercial Street, Leeds. 



Telescopes 



In our price-list of Telescopes will 

 be found illustrated and described 

 numerous patterns for Lool^-out 

 use. Astronomy, and many other 

 purposes. A copy of this list will 

 be sent post-free to any address. 



EGRETTI&ZAMBRA 



Scientific Instrument Makers. 



olborn Viaduct, London, E.C. 



City Branch : 45 Cornhill, E.C. 



West End : 122 Regent St., W. 



