cclx 



NATURE 



[August 28, 19 13 



GAS ANALYSIS 

 APPARATUS. 



(Manufactured at our oWn Works.) 



FOR 



GAS, ATMOSPHERES, 

 MINE AIR, &c. 



At constant volume 



or 

 constant pressure. 



Incorporating latest 

 methods of 

 absorption and 

 combustion. 



Copy of interesting 



list will be sent on 



application to 



ALEXANDER WRIGHT & CO., 



LTD., 

 WESTMINSTER. 



SCIENTIFIC INSTRUMENTS 



OF ALL DESCRIPTIONS. 



Tl*e " HARRIS " 

 SPECTROMETER. 



cheap 



ally designed for 



eliable lnstrumen 

 Students' u 



Very strongly constructed so that it may be used by 

 elementary pupils without being put out of order. 



PRICE £2 : 10 : Each Net. 



Descriptive Pamphlet on application. 



(1913) 



PHILIP HARRIS & CO., ltd 



BIRMINGHAM 



(ENGLAND.) 



TOWNSON & MERCER.I 



(Established 179S), 



Manufacturers ol Apparatus tor 



CHEMISTRY, PHYSICS, MECHANICS, 

 BACTERIOLOGY, METALLURGY, 



and all Science Subjects. 



LABORATORIES tlRMSHEI) AM) COMPLETELY EQUIPPED. 

 Apparatus for Students' Use. 



Sole Agents in the United Kingdom for 



Becker's Sons'. Rotterdam, Balances and Weights. 



Agents for the Glassware of Josef Kavalier and Schott & Gen. 



and Schleicher & Sehull's Filter Papers. 

 Contractors to the Home and Colonial Departments of H.M. Government, 

 War Office, India Office, Imperial College of Science and Technology and 

 the Universities and Principal Technical Institutions, County Councils, &c. 



34 Camomile Street, London, E.C. 



LOW PRESSURE 

 SENSITIVE FLAME 



(LORD RAYLEIGH'S SYSTEM). 



Special Form designed by Prof. SILVANUS P. 



THOMPSON, and used by him at his Lectures ort 



Sound at the Royal Institution. 



Complete with Rubber Tubing and Clip, £110 net. 

 Sole Makers : — 



A. GALLENKAMP & CO., LTD., 



19-21 Sun Street, Finsbury Square, London, E.C. 



nted by Richard Clay & Sons, Limited, at Brunswick Street, Stamford Street, S.E., and published by Macmillan and Co., Limited, at 

 St. Martin's Street, London, W.C, and The Macmillan Co., 66 Fifth Avenue, New York.— Thursday, August 28, 1913. 



