
— 
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“* To the solid ground 
Of Nature trusts the mind which builds for aye.”’—W' ORDSWORTH. 



No. 2779, “VOL. 111] 


Registered as a Newspaper at the t the General Pos eneral Post Office.) ye oe: ae 

BALANCES & WEIGHTS |; 
F.E.BECKER & C° 
&. J.GEORGE (LONDON) L'S PROPRIETORS 
29 HATTON WALL, LONDON.E.C.I 
Particulars and Prices on application to— 
JOHN J. GRIFFIN & SONS, L™. 
Kemble Street, Kingsway, 
London, W.C.2. 

SATURDAY, FEBRUARY 5 1923 



_[PRICE “ONE SHILLING 
{All Rights Reserved. 




VITREOSIL 
LABORATORY WARE 
Superior to Porcelain 
Constant in Weight 
Best Substitute for 
Platinum 
and more Economical 
ASK YOUR DEALER FOR IT 

SOLE MANUFACTURERS 
THE THERMAL SYNDICATE, LTD., 
VITREOSIL WORKS—WALLSEND-ON-TYNE. 
LONDON DEPOT—28 tage dag Dit S.W.1. 

WIRELESS 
APPARATUS 
stock 
also———————components 
Complete sets in 
Call or write 
EGRETTI © ZAMBRA 
38, HOLBORN VIADUCT.E.C.1, 
LONDON. 
