A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



No. 2754, Vol. i 10] 



SATURDAY, AUGUST 12, 1922 [Price Two Shillings 



Registered as a Newspaper at the General Post Office.] 



[All Rights Reserved. 



OPTICAL PROJECTION APPARATUS 

 EDUCATIONAL WORK. 



NEWTON & CO, 



Opticians to H.M. the King. 

 72 WIGMORE STREET, LONDON, W.l. 



SCIENTIFIC INSTRUMENT MANUFACTURERS 

 and LABORATORY FURNISHERS. 



Physical 



Apparatus 



for 



Schools 



and 

 Colleges. 



CHEMICALS 



Analytical, Technical and A.R. 



RECD. TRADE MARK APPARATUS 



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." 



%GRETTI © ZaXBRA 



38.HOLBORN VIADUCT. E.C.I. 

 LONDON. 

 FACTORY : HALF-MOON 

 WORKS. BARNSBURY. 



