f 



xv- 



^ kP 1 4 1922 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



' ' To the solid ground 

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



No. 2757, Vol. no] SATU RDAY, SEPTEMBER 2, 1922 [Price One Shilling 



Regist.-re<l a-- a V-w -papoi ■ ' '■■■■■■■ > ■■■ ' ' '"- ' l l|hl '' ! 



[All Rights Reserved. 



BALANCES & WEIGHTS 



SPECTROMETERS 



Particulars and Prices on application to— 



JOHN J. GRIFFIN & SONS, L TD 



Kemble Street, Kingsway, 

 London, W.C.2. 



SOLE MANUFACTURERS 



THE THERMAL SYNDICATE, LTD. 



VITREOSIL WORKS-WALLSEND-ON-TYNE. 

 LONDON DEPOT 28 VICTORIA ST.. S.W.I. 



HIGH RANGE 



THERMOMETERS 



Of Guaranteed Accuracy. 



NATIONAL PHYSICAL LABORATORY 



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



Above is a copy of certificate of a Thermometer 

 recently verified. 



^EGRETTI © ZAMBRA 



38.HOLBORN VIADUCT E.C.I. 

 LONDON. 



