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A WEEKLY ILLUSTRATED JOURNAL Of^CIENCE. 



To the solid ground 

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



No. 2752, Vol. ho] 



SATURDAY, JULY 29, 1922 



[Price One Shilling 



Registered as a Newspaper at the General Post Office.] 



OPTICAL PROJECTION APPARATUS 



For all classes of 



EDUCATIONAL WORK. 



NEWTON & CO., 



Opticians to H.M. the h'ui^. 

 72 WIGMORE STREET, LONDON, W.l. 



SCIENTIFIC INSTRUMENT MANUFACTURERS 

 and LABORATORY FURNISHERS. 



Physical 



Apparatus 



for 



Schools 



and 

 Colleges 



N S5B5 



. RESISTANCE BOX 



tt-15 CROSS STREET HATTON GARDEN LONDON ECI 



CHEMICALS 



Analytical, Technical and A.R. 



RECD. TRADE MARK APPARATUS 



Balances 



BENCHES 



Fume Chambers, etc., 

 for 



Chemical, Physical, and 

 A snow crystal Technical Laboratories. 



Price Lists and Estimates on Application. 



REYNOLDS & BRANSON, LTD., 



Contractors to the War Office, Admiralty and 

 Egyptian Government, &c. 



14 COMMERCIAL STREET, LEEDS. 



BAROGRAPHS 



Four rubber feet to the base 

 — a self - adjusting pen arm — 

 a supporting rod to the cover — 

 these are some of the refinements 

 on our Recording Barometers. 

 Write for price list " B. 3." 



NJEGRETTI © ZAMBRA 



38.H0LB0RN VIADUCT. E C. 1 . 



LONDON. 

 FACTORY HALF-MOON WORKS. 



BARNSBURY. 



