


























































A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“* To the solid ground 
Of Nature trusts the mind which builds for aye.” —\WORDSWORTH. 
No. 2775, VOL. 111] SATURDAY, JANUARY 6, 1923 [PRICE ONE SHILLING 
[All Rights Reserved. 







Registered as a Newspaper at the General Post Office.] 
BALANCES & WEIGHTS 


VITREOSIL 
LABORATORY WARE 
Superior to Porcelain 
Constant in Weight 
Best — sariba for 
Platinu 
and name Economical 
ASK YOUR DEALER FOR IT 
GIVE IT A 
TRIAL 

SOLE MANUFACTURERS 
F.E.BECKER & C® THE THERMAL SYNDICATE, LTD., 
i \W.& J.GEORGE (LONDON) L*® PROPRIETORS 
17 ro 29 HATTON WALL, LONDON.E.C.1 VITREOSIL WORKS—WALLSEND-ON-TYNE, 
LONDON DEPOT—28 VICTORIA ST., S.W.1. 
AND AT PARIS AND NEW YORK. 


SPECTROMETERS 
tere WIRELESS 
APPARATUS 
Complete sets in stock 
also———————components 

Call or write 
Particulars and Prices on application to— 
JOHN J. GRIFFIN & SONS, L™. EGREITI @ ZAMBRA 
Kemble Street, Kingsway, 38, HOLBORN VIADUCT.E.C.1. 
London, W.C.2. LONDON. 


