y 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



No. 2759, Vol. no] SATURDAY, SEPTEMBER 16, 1923 |TRiCE One Shilling 



Registered as a Newspaper at the General Post Office.] 



[All Rights Reserved. 



BALANCES & WEIGHTS 



SPECTROMETERS 



Particulars and Prices on application to — 



JOHN J. GRIFFIN & SONS, Ltd 



Kemble Street, Kingsway, 



London, W.C.2. 



REYNOLDS & BRANSON, Limited, 



Chemical and Scientific Instrument Makers to His Majesty's 



Government (Home and Overseas Dominions), Laboratory 



Furnishers and Manufacturing Chemists. 



Resistance Boxes. P.O. Boxes, etc., manufactured in our own 



Workshops. 



See Physical Catalogue. Post free on application. 



14 COMMERCIAL STREET, LEEDS. 

 HIGH RANGE 



THERMOMETERS 



Of Guaranteed Accuracy. 



NATIONAL PHYSICAL LABORATORY 



certificate of N. & Z. Thermometer No. D 10520. 



Above is a copy of certificate o? a Thermometer 

 recently verified. 



NIegretti © Zambra 



38,HOLBORN VIADUCT E.C.I. 

 LONDON. 



