—_ =" 7 
— oo 
A WEEKLY ILLUSTRATED JOURNAL OF SCHENGE. Sus? ~ 
“To the solid ground ae 
Of Nature trusts the mind which builds for aye.’’—WorRDSWoRTH. 
Nof23r1;. VOL 92] 
THURSDAY, FEBRUARY 12, 1914 _ 
[PRICE SIXPENCE 
Registered as a Newspaper at the’ General Post Office.) 
{All Rights Reserved. 
BUY DIRECT FROM 
REGeCKER& CO 
(W.&J. GEORGE, tTp.,SuUCC®s) e LONDON, E iG. 
doun J, GRIFFIN & Sous t° 
KEMBLE ST., KINGSWAY. _ LONDON, W.C. 
WEST’S APPARATUS 
FOR MEASURING 
THE PRESSURE OF LIGHT 
A very simple method of measuring the pressure of radiation from an 
electric lamp. (See Proc. of the Phys. Soc. of London, Aug. 15, 1913.) 
ELECTRIC HOT PLATES 
FOR LABORATORY USE 
(Heraeus System). 
With Automatic Temperature Control. 
Any temperature up to 250° C, maintained constant (by 
electrically-actuated relay) to within | or 2 degrees, 
REYNOLDS & BRANSON, Ltd. 
Awards—Gold Medals, Allahabad, London, and: Turin. 
Grand Prix, Tyrin. 
“RYSTOS” OPTICAL BENCH 
i = For use with 
the 
Stroud & Rendell 
Science Lantern. 
Optical Bench for lantern, one metre long, without fittings, £1 10 O. 
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 
0°, 90°, 180° and 270°, 9/- Glass prism 60°, mounted in special holder, 4/6. 
Half-metre extension with foot, 12/6. . 
The above can also be used without the lantern as an ordinary optical 
bench, and any part can be supplied separately. 
New Catalogue of Optical Lanterns and Accessory Apparatus for the 
“S.G& R.” lantern, post free. 
1a COMMERCIAL STREET, LEEDS. 
LEER 
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 
been _ introduced, 
It is efficient, re- 
liable, and accurate. 
Illustrated List 
NEGRETTI & ZAMBRA of “Rain 
38 Holborn Viaduct, London, E.C. pe, 
City Branch: 45 Cornhill, E.C. the “Fernley,” 
West End: 122 Regent St., W. sent post free. 
