|Graphite-Selenium Cells 
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‘A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
Ade) ee PS “To the solid ground 
~"“Of Nature trusts the mind which builds for aye..—Worpswortu. 
No. 2453, VOL. 98] THURSDAY, NOVEMBER 2, 1916 [PRICE SIXPENCE. 
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Registered as a Newspaper at the General Post Office.] 
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\ BALANCES & WEIGHTS 
BUY DIRECT FROM 
FE,BECKER & CO, #ATTON WALL, 
(W.&J.GEORGE. LTD.,SUCC#?) LONDON, E CG. 
FOURNIER D’ALBE’S PATTERN. 
Great Stability and High Efficiency. 
With a sensitive Se surface of 5 sq. cm, and a voltage 20 the 
additional current obtainable at various illuminations (in 
metre-candles) is :— 
At Pai.c. ia . t+ milliamp. 
E> GD agen sins ee | “= 
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, W.C. 
(All Rights Reserved. 
BASINS, BEAKERS, © BOATS, 
CAPSULES, CONDENSERS, 
specialise 
in the manu- 
facture of 
apparatus to. cus- 
tomers’ own designs. 
New prices and sample free 
on application to 
THE SILICA SYNDICATE, Ltd., 
82 HATTON CARDEN, 
LONDON, E.C. 
Telephone: Holborn 6380. 
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 CORNHILL, E.C.; 122 REGENT ST., W. 
