roan 
' 
No. 2309, VOL. 92] 
A WEEKLY ILLUSTRATED JOURNAL. OF SCIENCE, 
“* To the solid ground 
Us Nature trusts the mind which builds for aye. 
"-—WoRDSWORTH. 
‘THURSDAY, JANUARY 29, 1914 
[PRicE SIXPENCE 
Registered as a Newsnaper at the General Post Office.) 
{All Rights Reserved. 
BUY DIRECT FROM 
F.E.BECKER & CO, HATTON WALL, 
(W.&J.GEORGE, LTD., SUCC®) ; LONDON, E C, 
JOHN J. GRIFFIN & Sons, 
Kemble St., KINGSWAY, LONDON, W.C. 
THE— 
‘ \ (C. V. Boys's Patent.) eC > 
g For Studying Liquid Films. , 
Marvellous Unique 
Colour- Effects 
combinations of 
of Infinite Wonderful 
Variety. Beauty. 
Packing and Carriage 
ts 
Price 25/- in United Kingdom, 1/= 
Including 2 Bottles of special Soap Solution and Full Instructions, 
A NEW. CHEAP FORM. 
Price 22/G_ Postage 4d. Extra Bottles of Solution, Gd, 
Erecting Prism! C” 
Lantern fitted with 44” condenser .. ne at i oi 
REYNOLDS & BRANSON, Ltd. 
(GRAND PRIX, TURIN, 1911.) 
THE “RYSTOS” EDUCATIONAL LANTERN. 
With Iron Body (suitable for any illuminant), Side door and brass sight 
hole, walnut base, meniscus condenser 4} in. diameter, objective of 
superior quality 2§ in. diameter, 6, 7, 8, 9, 10 or 12 in. focus, with rack-and 
pinion. Complete i in travelling case, but without burner... £5.12. 6 
in metal mount » vextra» 4 
“Phenix Arc Lamp for above... aoe we aim = 
For Optical Lanterns»of other dioheenis see catalogue, 
10th edition, 40 pages, post free, 
14 Commercial Street, Leeds. 
Negretti & Zambra’s 
Recording Rain Gauges. 
The 
‘FERNLEY’ 
(illustrated) is the 
latest autographic 
self-syphoning rain 
gauge. It is simple 
but ingenious, and 
many new ideas and 
improvements have 
introduced, 
It is. efficient, re- 
been 
liable, and accurate, 
Illustrated List 
NEGRETTI & ZAMBRA 
of “ Rain 
38 Holborn: Viaduct; London, E.C. prea i 
City Branch: 45 Cornhill, E.C. the “Fernley,” 
West End: 122 Regent St., W. 
sent post free. 
