NA TURE 



[July 27, 1905 



Dr. J. S. HALDANE'S 



rOK ANALYSIS OF MINE GASES. 



(See " The Investigation of Mine Air," I'y Sir C. Le Neve Foster and 

 Dr. HaUane, 1905, /. n6.) 

 The Apparatus is arranged in a portable Mahogany Cabinet, with a rod to 

 screw into the base, so that it 

 may be stood against the sides 

 of a gallery in the mine, and 

 [he analysis made on the spot. 



The external 



V4 



dimensions of the 



13 X 7i X 3i 

 inches, and the 

 » eight when 



charged ready 



for use is about 



five pounds. 



Dr. Haldane's Mine Gas Apparatus £3 17 6 

 Mercury, pure, for same, 2-lb. in 



bottle 8 6 



Caustic Potash Solution, i-pint in 



bottle 10 



"The Investigation of Mine Air," 



by Sir C, Le Neve Foster and 



Dr. Haldane, 1005 6 



Sole IVIaKers: C. E. MULLBR, ORME & CO., Ltd., 

 148 HIGH HOLBORN, LONDON. W.C. 



THE 



WOODHOUSE 

 INCLINED PLANE. 



Price 25/- 



TOWNSON & MERCER, 



34 CAMOMILE STREET, E.C. 



ELECTROLYTIC CONDENSERS 



OF 



100 mf. CAPACITY 



occupy a space of only 12 12 - 14 in. high. 



THE NEW GRISSON VALVE 



(A RELIABLE ELECTROLYTIC RECTIFIER). 



W^~ Both the above are now to be seen working here, or Illustrated Descriptive Pamphlets may be had on application. 



ISENTHAL & CO., 85 Mortimer Street, London, W. 



Contractors to the Admiralty, War, India, and Colonial Offices, dc. 



