“A WEEKLY ILLUSTRATED JOURNAL oF schindt! 30%: 
i 
: "Stites 
“To the solid. ground wy 
Of Nature trusts the mind which builds for aye."—WorpsworTH.' ORS AS 
£0 oy) h on wy 
——————Sa———————————— 
No. 2450, VOL. 98] 
THURSDAY, OCTOBER 12, 1916 
[PRrice-S1XPENGE: - 
Registered as’a Newspaper at the General Post Office.] 
{All Rights Reserved. 
X-RAY TUBES 
’ Of all descriptions Made, 
Repaired, & Re-exhausted 
on the Premises. 
s Coolidge Tubes kept in stock. 
NEWTON & WRIGHT, Ltd. 
72 WIGMORE STREET, W. 
Sole Agents for Macalaster Wiggin X-Ray Tubes, 
Undoubtedly the Finest Tubes 
in the World for all purposes, 
DUROGLASS L”™: 
14 GROSS STREET, HATTON GARDEN, E.C. 
Manufacturers of 
Borosilicate Resistance Glassware. 
Beakers. Flasks, Ete. 
Soft Soda. Tubing for Lamp Work. 
General Chemical and 
Scientific Glassware. 
“Special Glass Apparatus: Made-to. Order. 
DUROCGLASS WORKS, WALTHAMSTOW. 
; SOLE SELLING AGENTS: 
BAIRD & TATLOCK (LONDON) LTD. 
14 CROSS ST., HATTON GARDEN, E.c. 
REYNOLDS & BRANSON, Ltd., 
Chemical and Scientific Instrument. Makers to His Maijesty’s 
Government (Home and Overseas Dominions), Laboratory 
Furnishers and Manufacturing Chemists. 
‘*Rystos” Bench, 
showing bottles 
with enamelled 
labels on eachside. 
One: set of bottles re- 
quired for each four 
Students as supplied 
to the Modern School, 
Bedford, &c. 
CHEMICAL, PHYSICAL, and TECHNICAL LABORATORIES 
Fully Equipped with BENCHES, FUME CHAMBERS, &c. 
INSTITUTIONS EQUIPPED :— 
The Girls’ High Schools at Barnsley, Beverley, Doncaster, Leeds, Nuneaton, 
Sherborne, and York; Radley College, Oxford ; The Schools, Shrewsbury ; 
Wellington College, Berks; St. Mary's College, Winchester ;-the! Stience 
Laboratories at the Grammar School, Dunstable ; Laboratories at Brunner, 
Mond & Co,, Ltds ; Shelton Iron, Steel, and Coal Co., Ltd. ; Meadowcroft & 
Sons, Ltd. ; R. Graesser ; the National Physical Laboratory, Teddington ; 
Transvaal Dept. of Agriculture (Experimental Farm), South Africa; The 
Technical Schools, Morley and Yeadon ; Imperial Service College, Windsor ; 
Grammar Schools, Batley and Stamford ; The Ladies’ College, Harrogate, 
and*many others. 
Catalogue of Chemical and Physical Apparatus and Chemicals, 
post free on application. 
Designs of Benches and Fittings to suit all requirements. 
14 COMMERCIAL STREET, LEEDS. 
A New Barograph—THE ‘‘ JORDAN.” 
(Regd. Design €2871.) 
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. 
