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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which builds for aye..—WoRDSWORTH. 
No. 2457, VOL. 98] | THURSDAY, NOVEMBER 30, 1916 _ 
[Price SIXPENCE. 
Registered as a Newsnaner at the General Post Office.] 
(All Rights Reserved. 
BUY DIRECT FROM 
FE.BECKER & CO, HATTON WALL 
(W.&J.GEORGE. LTD., SUCC#?) 
Graphite-Selenium Cells 
FOURNIER D’ALBE’S PATTERN. 
Great Stability and High Efficiency. 
With a sensitive Se surface of §.sq. em. and a voltage 20 the 
additional current ob ainable at various illuminations (in 
metre-candles) is :— 
At hi ee .. +} milliamp. 
MESO. 4, © =x pye ofl ny 
At 500 2 
For particulars and prices apply to the SOLE AGENTs : 
John J. Griffin & Sons, 
Makers of Physical and Electrical Apparatus, 
Kemble Street, KINGSWAY, 
LONDON, wW.c. 
REYNOLDS & BRANSON, Ltd., 
Chemical and Scientific Instrument Makers to His Majesty’s 
Home & Overseas Dominions), Laboratory Furnishers 
and Manufactu ‘ng Chemists. 
Government | 
CHEMICAL, PHYSICAL, and TECHNICAL LABORATORIES 
Fully Furnished with BENCHES, FUME CHAMBERS, &c. 
INSTITUTIONS EQUIPPED INCLUDE :— 
St. Mary’s College, Winchester ; and many others 
Catalogue of Chemical and Physical Apparatus and Chemicals post free. 
Designs of Benches and Fittings to suit all requirements. 
124 COMMERCIAL STREET, LEEDS. 
A New Barograph—THE ‘‘ JORDAN.” 
(Regd. Design 62871.) 
Shows at a glance the movements of the barometer during 
the preceding days. 
Descriptive Leaflet post free on application to 
NEGRETTI & ZAMBRA, 
38 HOLBORN VIADUCT, E.C.; 
45 CORNBILL, E.C.; 122 REGENT ST., W. 
: & 
Clonal, Muse? 
