


SS = = 
a —— = 
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE, 
‘* To the solid ground 



Of Nature trusts the mind which builds for aye.’,—\WORDSWORTH. 
| No. 2778, Vot. 111] | SATURDAY, JANUARY 27, 1923 [PRICE ONE SHILLING 
: Registered as a Newspaper at the General Post Office.) Pa ‘ IS pe {All Rights Reserved. ; 

OPTICAL PROJECTION APPARATUS REYNOLDS & BRANSON, Lto. 
for all classes of LABORATORY FURNISHERS AND MANUFACTURING CHEMISTS. 
EDUCATIONAL WORK. ) 




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 pth milligramme 
with alessload .. .. .. £14 14 © 
Catalogue on application, 
N E W TT Oo N & Cc Oo Balances renovated and repaired in our own Workshops. 
2 ‘ ~~ | For Analytical and other Balances and Weights, see special Catalogue. 
Opticians to H.M. the King. | Catalogues of Chemical and Physical Apparatus and Chemicals. 
>, s 
72 WIGMORE STREET, LONDON, W.1. Pout Fre ae rea. 
44 Commercial Street, Leeds. 

BAIRD & TATLOCK (LONDON) Ltd. 
14-15 CROSS STREET, 
HATTON GARDEN, WIRELESS 

SIMPLE 
MICROBAROGRAPH APPARATUS 
Showing fall in barometric 
Complete sets in stock 
pressure by so small a rise 
as one foot. also 
Pamphlet giving working | | Call or write 
instructions and_ experi- 
ments sent with instrument. FGRETTI ® TAMBRA 
PRICE ) 38, HOLBORN VIADUCT E.C1l. 
£1 126 LONDON. 

components 


