— 

A WEEKLY ILLUSTRATED 

JOURNAL OF SCIENCE. 
** To the solid ground 
Of Nature trusts the mind which builds for aye.”"—\VoRDSWORTH, 
INDEX NUMBER 
No. 2780, Vor. 111] 




SATURDAY, FEBRUARY 10, 1923 


[Price Two SHILLING Ss 


Registered as a ‘Newspaper at the General Post ‘Office. )- ; ne 
“| (All Rights Reserved. 





NEWTON’S 
Model D 
EPISCOPE 
for the projection of 
OPAQUE OBJECTS 
including 
| MAPS, DRAWINGS, 





NEWTON'S 



EPISCOPE 
Move: D. 
DIAGRAMS, PRINTED 
and TYPED MATTER, 
ILLUSTRATIONS, 
NATURAL OBJECTS, 
etc, 










Price 



— £351 10 0 
uk tneking. NEWTON & CO. ‘200 years 


Specialists in Optical P, rojection Apparatus, 
72 WIGMORE STREET, LONDON, w.1. 



14-15 CROSS STREET, 
HATTON GARDEN, E.C.1. 





SIMPLE 
MICROBAROGRAPH 


Showing fall in barometric 
pressure by so small a rise 
as one foot, 



Pamphlet giving working 
instructions and experi- 
ments sent with instrument. 




PRICE 
12 6 


£1 



CHEMICALS 
Analytical, Technical and A.R. 
RECD, TRADE MARK A 
PPARATUS 
Balances 




><. BENCHES 
=O Gms Fume Chambers, etc., 
INGN 

Chemical, Fiigelens, and 
A SNOW CRYSTAL Technical Laboratories. 
Price Lists and Estimates on Application. 
Wireless Apparatus and Accessories supplied. 
Also New Catalogues of Chemical eee aad Chemicals. 
REYNOLDS & BRAN BRANSON, LTD., 
Contractors to the War Office, Admiralty and 
Egyptian Government, &c. 
14 COMMERCIAL STREET, LEEDS. 






fe FES 2 cj 
APPARATUS 
Complete sets i “in stock 
also components 

Call or write 
EGRETTI @ ZAMBRA 
38,HOLBORN VIADUCT EC, 
LONDON. 
