^J s 



A WEEKLY ILLUSTRATED JOURNAL OF 



' ' To the solid ground 

 Of Nature trusts the mind which builds for aye." — WoR/fs\lTORTH, 



No. 2771, Vol. no] ~ SATURDA Y, DECEMBER 9, ^92 2 -ffiffCfrgKE SHlfc^iNcT 



Registered as a Newspaper at the General Post Office.] ,„„„•,....,/ 



[All KieUtSR/served. 



BALANCES & WEIGHTS 



SPECTROMETERS 



Particulars and Prices on application to — 



JOHN J. GRIFFIN & SONS, L™- 



Kemble Street, Kingsway, 

 London, W.C.2. 



REYNOLDS & BRANSON, Ltd. 



Chemical Glassw 

 to His Majesty's 



Gold Medal 



STROUD 



: and Gold Medal 



SCIENCE LANTERN. 



The "University" Lan- 

 tern, with Russian iron 

 body, sliding baseboard, two 

 superior objectives, with rack 

 and pinion for focussing, con- 

 densers 4 J in. diam., plane 

 silvered mirror "A," which is 

 moved by a knob causing the 

 rays to be reflected upwards 

 - for the projection of objects 

 ^& in a horizontal plane silvered 

 which can be used at 



pns 



'D.' 



or arc lamp, slide carrier, complete in travelling case, with reversible 

 adjustable stage for supporting apparatus. 



PRICE ON APPLICATION. 



Wireless Apparatus and Accessories supplied. 



CATALOGUES (Post Free). 



Optical Lanterns and Accessory Apparatus Chemical 



Apparatus and Chemicals New Edition ', etc., etc. 



14 COMMERCIAL STREET, LEEDS. 



The Weather 

 Watch is an ideal 

 Christmas Gift. 

 It forecasts the 

 weather for the 

 coming 12 hours. 

 In case 



£7 IO O 



Negretti © Zambra 



38.H0LB0RN VIADUCT E C. 1 . 

 LONDON. 



