90 OF 4 2 
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which builds for aye.’,—WoRDSWORTH. 
No. 2307, VOL. 92] 
THURSDAY, JANUARY 15, 1914 
[PRicE SIXPENCE 
Registered as a Newspaper a1 the ‘seneral Post Office.) 
{All Rights Reserved. 
BALANCES & WEIGHTS 
— 
BUY DIRECT FROM 
F.E.BECKER & CO, HATTON WALL, 
(W.&J.GEORGE. LTp.,SUCC#s) ; LONDON, E .C. 
JouN J. GRIFFIN & SONS, L° 
Kemble St., KINGSWAY, LONDON, W.C. 
\ | (C. V. Boys's Patent.) e@ 
ee For Studying Liquid Films. , 
THE— 
Marvellous Unique 
Colour- Effects 
combinations of 
of Infinite Wonderful 
Variety. 4 Beauty. 
~ Packing and Carriage 
Price 25/- in United Kingdom, 1/- 
Including 2 Bottles of special Soap Solution and Full Instructions, 
A NEW CHEAP FORM. 
Price 2/G Postage 4d. Extra Bottles of Solution, 6d. 
REYNOLDS & BRANSON, Ltd. 
“RYSTOS” OPTICAL BENCH 
For use with 
the 
Stroud & Rendell 
Science Lantern. 
Optical Bench for lantern, one metre long, without fittings, £1 10 0. 
:Half-metre extensiois for ditto, 12/6. 
Sliding tables, 3/6 each. Lens holders, 4/6. Adjustable slit, 4/9. 
Screen holder, 4/- Standard candle holder, 1/- Circular table, 1/6. 
Screen with gauze, 3/6. Rotating holders for nicol prisms graduated at 
6°, 90", 180° and 270°, 9/= Glass prism 60°, mounted in special holder, 4/6. 
The above can be used without lantern as an ordinary optical bench. 
New Catalogue of Optical Lanterns and Aczessory Apparatus, post free. 
1a COMMERCIAL STREET. VEEDS. 
Nene ee ee eee ccna cnc cee EEE 
Negretti & Zambra’s 
Latest Outdoor 
Thermometer 
is a “Six’s”’ pattern—registering 
the highest, lowest, and present 
temperatures—with a scale of 
enamelled steel. This method 
of construction ensures Dura- 
bility, Legibility, and Cleanliness. 
Price, unframed, G/-. Mounted 
in metal frame, as illustrated, 12/6 
Price List 
of ** Thermometers ” will 
be sent free on request. 
NEGRETTI & ZAMBRA 
38 Holborn Viaduct, London, E,C. 
City Branch: 45 Cornhill, E.C. 
West End: 122 Regent St., W. 
