y 
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which builds for aye."—WorbsworTi. 
No. 2465, VOL. 98] THURSDAY, JANUARY 25, 1917-_ ~ [Price SIxPENCcE. 
Registered as a Newspaper at the General Post Office.] [All Rights Reserved. 
REYNOLDS & BRANSON,'Ltd., 
Chemical and Scientific Instrument Makers to His Majesty’s 
Government (Home & Oversexas Dominions). Laboratory Bee 
and Manufactn-ing Chemists. pete 
BALANCES & WEIGHTS | 
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Fully Furnished with BENCHES, FUME CHAMBER- we 
INSTITUTIONS EQUIPPED INCLUDE :— 
The National Shell Filling Factory, Leeds, and various Munition Works ; 
Che National Physical Laboratory, Teddington ; Laboratories at Messrs. 
Brunner, Mond & Co., Ltd., Northwich; Messrs. Meadowcroft & Son, Ltd., 
Blackburn; The Shelton Iron, Steel and Ccal Co.; Science Laboratories 
at the Grammar School, Dunstable; Imperial Service College, Win isor ; 
Batley Grammar School ; Transvaal Dept. of Agriculture (experimental 
Farm), Potchefstroom ; The Technical Schools, Morley and Yeadon; The 
Girls’ High Schools at Barnsley, Beverley, Doncaster, Leeds, Harrogate, 
Nuneaton, Sherborne, and York ; Radley College, (»xford; The Schools, 
Shrewsbury; 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. 
14 COMMERCIAL STREET, LEEDS. 
A New Barograph—THE ‘‘ JORDAN.” 
(Regd. Design 62871.) 
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Graphite-Selenium Cells 
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 1 m.c. ... . } milliiamp. 
BEE ED! 55. \;--. sae | + 
At500 ,, .«. eee 9 
For particulars and prices apply to the SOLE AGENTs : 
Shows at a glance the movements of the barometer during 
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John J. Griffin & Sons, | sean tt hae) a pan ei to 
Makers of Physical and Electrical Apparatus, NEGRE TTL & ZAMER A 
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Kembie Street, KINGSWAY, 
: 38 HOLBORN VIADUCT, E.C.; 
LONDON, w.c. 2 : 
: 45 CORNBILL, E.C.; 122 REGENT ST.., W. 
