





















A WEEKLY ILLUSTRATED JOURNAL 
‘* To the solid ground 
Of Nature trusts the mind which builds for aye.””—WoRDSWORTH. 
——— 

‘) 
2 “GN 
Y ORATENF i903 




No. 2797, VoL. 111] SATURDAY, JUNE 09, 1923 




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Registered as a Newspaper at the General Post Office.) z 

BALANCES & WEIGHTS 
F.E.BECKER & C° 
W. & J.GEORGE (LONDON) L'? PROPRIETORS 
17 10 29 HATTON WALL, LONDON.E.C.1 
SPECTROMETERS 
Particulars and Prices on application to— 
JOHN J. GRIFFIN & SONS, LT. 
Kemble Street, Kingsway, 
London, W.C.2. 



REYNOLDS & BRANSON, Ltd. 
Complete Laboratory Furnishers and Manufacturers of Chemicals, 
Chemical, Physical, Optical, and Photographic Apparatus. 



“RYSTOS " MICROSCOPE LAMP can be supplied fitted for either electric 
globe or incandescent gas mantle (if former, state voltage). PRICE COMPLETE 
with 2}” plano-convex condensing lens with 6 feet of flexible cord and 
bayonet plug. The lamp can be raised, lowered, or tilted to any required 
angle: £1: 10:0. Bulb extra according to Voltage. 
Can be easily adapted as a Lecturer’s Reading Lamp. 
14 COMMERCIAL STREET, LEEDS. 
ee eens 
he 
tins 
AUGES 
reading to -02” 
for the accurate 
measurement’ of 
small __ pressures. 
Quotations on request. 
NEGRETTI & ZAMBRA <a 
38 HOLBORN VIADUCT, E.C.1. 
LONDON. 

