xiii 
BATTERSEA POLYTECHNIC, S.W. 
Principal—F. H. Newman, M.A., Ph.D. 
Technical Day College for students wishing to enter the 
Engineering, Architectural, Chemical, or similar professions, 
University Courses, day and evening, under recognised 
teachers, for London University degrees in Science, Wngin- 
eering, and Music. 
Training Department of Domestic Science for Teachers of 
Domestic Subjects. 
Physical Training College for Teachers of Swedish, 
Educational, and Remedial Gymnastics. 
Departments of Hygiene and Physiology, Commerce, and 
Music. 
School of Art and Crafts. 
Hostels for Women Students. 
For particulars apply to the SrcreTary, Battersea Poly- 
technic, 8. W. 
i 
BRADFORD EDUCATION COMMITTEE. 
TECHNICAL COLLEGE. 
Principal—Prof. W. M. Garpyer, M Sc., F.1.C. 
SPECIAL DAY DIPLOMA COURSES (3 or 4 years) in 
(1) Dyeing and Textile Chemistry. 
(2) General Industrial and Analytical Chemistry. 
(3) Metallurgical Chemistry and Assaying. 
(4) Chemical and Gas Engineering. 
(5) Research in Textile Chemistry. 
Visits to Works and the solution of Works difficulties are made 
special features. 
DAY SESSION, 1916-17, has now commenced. 
A pamphlet—‘‘Industrial Chemistry and Dyeing as a Career for Men 
and Women "-—post free on application, 
Education Office, Bradford, 
October, 1916. 
BY ORDER. 
BRADFORD EDUCATION COMMITTEE. 
TECHNICAL COLLEGE. 
WOMAN ASSISTANT LECTURER AND DEMONSTRATOR 
IN CHEMISTRY. 
Apmlicniess are invited for this appointment. 
beo 
Further particulars may 
tained from the Principat of the College. 
BY ORDER. 
Education Office, Bradford. 
CASTLEFORD SECONDARY 
SCHOOL (DUAL). 
REQUIRED in January a SENIOR MISTRESS. Salary £180 to 
£200. Applications to be sent to the undersigned on or before October 23, 
Mr. C. T. LIGHTLEY, 
Clerk to the Governors, 
77 Carlton Street, Castleford. 
WANTED. ATTENDANT with Chemical 
Laboratory Experience.—Box 190, c/o Nature Office. 
SECOND-HAND MICROSCOPES, 
Swift ‘‘ Dick” Petrological,2-in., 1-in., and }-in. objectives, 
eyepiece, quartz wedge, mica and selinite plates, detach- 
able mechanical s'age ; as new ... <n ar cn Sal’ y AO) 
Baker ‘‘D.P.H.,’’ No. 1, eyepiece, mechanical stage, 
centring substage ... 1p 4 aig aa va -- £10 0 0 
Beck ‘‘Popular’’ Binocular, 2-in., 1-in., and 4-in. objec- 
tives, 2 pairs of eyepieces, and polariser 15 0 
Leitz Ila, Nos. 3 and 7 Reichert objectives, dcuble nosepiece, 
eyepiece, Abbe andiris ... aa an ak <5 us og. 88 
Swift ‘* Wales” Model, 2 objectives, double nosepiece, 
eyepiece + ai Avs es ak + ate ic oe 
Leitz Ilb, A and D Zeiss objectives, double nosepiece, eye- 
piece . a £6 15 
Bausch & Lomb, 2 cyepieces, 2/3 and 1/6 objectives, double 
nosepiece, spiral substage ons ai Sup AS oss 
Watson ‘‘ Praxis,’’ Nos. 3 and 7 Leitz objectives, double 
nosepiece, eyepiece ay “is a aes a ave 
Beck Small ‘‘London,” 2/3 and 1/6 objectives, double 
nosepiece, eyepiece os 2 at RA we wos SB 17 
A number of LEITZ OBJECTIVES in Stock at Original 
Catalogue Prices. 
CLARKSON’S SECOND-HAND OPTICAL MART, 
$88 HIGH HOLBORN, LONDON, (Opposite Gray's Inn Road.) 
° 
° 
° 
£6 10 0 
£5 17 6 
6 
NATURE 
| THE BRITISH OXYGEN COMPANY LTD. 
[OcTOBER 12, 1916 
Works for the production of Oxygen and other gases in London 
(Westminster, Greenwich and Stratford), Birmingham, Cardiff, 
Wolverhampton, Manchester, Birkenhead, Sheffield, 
Newcastle-on-Tyne, Glasgow, and Sydney, N.S.W. 
The Company was formed in 1886 as Brin’s Oxygen Company to 
develop means for the production of Oxygen on an industrial scale, 
The Company is not only the acknowledged pioneer of the Oxygen 
Industry, but possesses the largest organisation in the World for the 
production and distribution of that gas. 
The Company also manufactures and supplies in cylinders, 
NITROGEN, HYDROGEN, CARBONIC ACID, and other gases. 
The Company has developed an extensive engineering business, and 
has specialised in the design and manufacture of Plant for the production 
and separation of gases by liquefaction, electrolysis, and other methods. 
The Company is the exclusive manufacturer in the United Kingdom 
of apparatus for metal cutting by Oxygen, and also manufactures well- 
known types of gas Regulators, Oxy-Acetylene and other blowpipes, and a 
large variety of apparatus for use with gas cylinders. 
For illustrated price lists and full particulars application should be made 
to any of the Company's Works or to the Head Office, Elverton 
Westminster, S.W. 
HARRINGTON’S 
PURE CHEMICALS 
AND REAGENTS 
“A.R.” STANDARD. 
Photographic Chemicals. Technical Chemicals. 
OBTAINABLE THROUGH ALL DEALERS, 
But Specify ‘‘ Harrington's.” 
Lists on application to 
HARRINGTON BROS., Ltd., 
Wholesale and Manufacturing Chemists, 
4 OLIVER’S YARD, CITY ROAD, LONDON. 
IONIUM 
Permanent Alpha Ray Activity 
RADIO-LEAD | 
MESO-THORIUM 
Glew's Scintilloscopes charged with IONIUM, 
RADIUM, MESO-THORIUM, or ACTINIUM, 
7/6 each. 
Scintilloscopes showing Double Scintillations 
Thorium ‘A,” 15/= each. 
F. HARRISON GLEW, 
156 CLAPHAM ROAD, LONDON, 8.W. 
SMALL ELECTRIC LAMPS 
FOR ALL 
SCIENTIFIC PURPOSES. 
Apply to the ACANUFACTURERS : 
A. C. COSSOR, Ltd., 
59-61 Clerkenwell Road, LONDON. 
