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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE, 
“ To the solid ground 
Of Nature trusts the mind which builds for aye.””—WoRDSWORTH. 
No. 2787, VOL. 111] SATURDAY, MARCH 31, 1923 [PRICE ONE SHILLING 
Registered as a Newspaper at the General Post Office.] {All Rights Reserved. 
BALANCES & WEIGHTS | REYNOLDS & BRANSON, Lro. 
LABORATORY FURNISHERS AND MANUFACTURING CHEMISTS. 











Balance, Analytical, Rystos 
New Model. Improved vertical 
movement of rider hook, rider scale 
running from end to end of beam and 
plumb line. The bearings are agate 
throughout; the beam of hard 
magnalium. Base of black crystal. 
Mahogany case with counterpoised 
front, hinged side doors and sliding 
back and brass levelling screws. To 
carry 200 grammes, sensitive to }th 
milligramme, or yyth milligramme 
witha lessload .. .. .. £14 0 0 

ai « ° - 
Balances renovated and repaired in our own Workshops. 
a a =) od 14 a 4 & ce For Analytical and other Balances and Weights, see special Catalogue. 
W. & J GEORGE (LONDON) L8 PROPRIETORS Catalogues of Chemical and Physical Apparatus and Chemicals. 
17 ro 29 HATTON WALL, LONDON.E-C.| Post Free on request. 
14 Commercial Street, Leeds. 
HUMIDITY 
OF san 

SPECTROMETERS 



RECORDING ASSMAN 
PSYCHROMETER 
with Ventilating Fan and Electric Motor. 
Write for full particulars. 
EGRETTI @ ZAMBRA 
38, HOLBORN VIADUCT. E.C.l. 
LONDON. 
Particulars and Prices on application to— 
JOHN J. GRIFFIN & SONS, LT. 
Kemble Street, Kingsway, 
London, W.C.2. 
