«*£ 



4 192: 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



No. 2773, Vol. no] SATURDAY, DECEMBER 23, 1922 [Price One Shilling 



Registered as a Newspaper at the General Post Office.] 



tAll Rights Reserved. 



BALANCES & WEIGHTS 



SPECTROMETERS 



Particulars and Prices on application to — 



JOHN J. GRIFFIN & SONS, Ltd. 



Kemble Street, Kingsway, 



London, W.C.2. 



REYNOLDS 81 BRANSON, Limited. 



"RYSTOS" STILL. 



Improved Central Flue Water Still and Condenser. 



In this pattern the heat is conducted through the water by means of ; 

 central tube, ensuring economy of heating. The condenser worm is o 

 pure tin, and the water jacket is air-cooled on two surfaces. One-gallor 

 size (1 litre distilled water per hour), solid copper. Ring Burners for same 

 Price of various sizes on application. 



Wireless Apparatus and Accessories supplied. 



Catalogue of Chemical Apparatus and Chemicals 



(New Edition), post free. 



14 COMMERCIAL STREET, LEEDS. 



WIRELESS 



APPARATUS 



Complete sets in stock 

 also- components 



Call or write 



%GRETTI © ZAMBRA 



38.H0LB0RN VIADUCT. E.C.I. 

 LONDON. 



