A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
eS “To. the solid ground 
3 ‘ Of Nature trusts the mind which builds for aye."—WorpswortH. 
| No. 2454, VoL. 98] THURSDAY, 
NOVEMBER 9, ‘1916 
[ PRICE SIXPENCE. 
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. 
—_——_ -—-_ = 
Coolidge Tubes kept in stock. 
‘T 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 CROSS STREET, HATTON GARDEN, E.C. 
Manufacturers of 
Borosilicate Resistance Glassware. 
. . Beakers. Flasks, Etc. 
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. 
AA AAA APPT AAA DODDS OO LO IDY eeeece rere. 
OULD TDD 100 - LEE ltt Ltt CLL 
\ 
SO 
Ss 
BRITISH MADE Glass, 
Porcelain, Nickel Ware and 
Filter Papers. 
ITY 
SS 
NONI 
Chemicals, Optical 
Lanterns, and Lantern Slides. 
Apparatus in Glass, Metal, or 
Wood made to customers’ own 
Designs. 
CATALOGUES POST FREE. 
MULL UML UY Td 
14 COMMERCIAL ST 
LEEDS 
A New Barograph—tTHE ‘‘ JORDAN.” 
(Regd. Design 62871.) 
Shows ata 2 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. 
