Adeney — An Apparatus for Gas Analysis, 8fc. 555 



great disadvantage of rendering the apparatus much more compli- 

 cated and liable to fracture. I have endeavoured to make the 

 apparatus here described as simple as proper regard for accuracy of 

 result will allow, in the hope that it will supply the want of an 

 effective and simple apparatus, which I have, in common with other 

 chemists, experienced in teaching methods of analysis involving the 

 evolution, collection, and measurement of gases, and that it will be 

 consequently found useful in a laboratory in which advanced 

 students are taught, as well as for the purposes of research work. 



With reference to the possibility of maintaining the apparatus 

 in good working order, I may say that I have employed it for a 

 large number of experiments of various kinds during the past six 

 months, and have found no difficulty in maintaining the stopcocks 

 in such good order that a vacuum can be maintained in the 

 burette and pressure tube unimpaired for several days. Some 

 difficulty was at first experienced when attempting to subject a 

 gas in the burette to high pressure, owing to the stopper of the 

 burette being loosened and pressed out. The difficulty was 

 overcome by lubricating the stopper with a mixture of beeswax and 

 vaseline. 



Other advantages of the apparatus besides simplicity and wide 

 range of applicability are its comparative freedom from the risk 

 of breakage, and its cheapness. The glass parts, 1 with the excep- 

 tion of the scale at the back of the pressure tube, were obtained at 

 a cost of 45s. ; the cost of putting the parts together, including 

 time and fittings, was about 40s. ; and it may be taken that the 

 apparatus cost in all not more than £5. 



In conclusion I desire to express my sincere thanks to my old 

 pupil and friend Mr. James Carson, O.E., Assoc. R. 0. Sc. I., 

 for the aid he has unsparingly given me in making a large 

 number of laborious experiments with which to test the apparatus. 

 My thanks are also due to John Connolly, the laboratory assistant 

 in the Royal University for the skilful assistance he has rendered 

 me in fitting the apparatus together. 



1 My acknowledgments are due to Messrs. Baird and Tatlock of Glasgow, through 

 whom I ohtained the glass parts of the apparatus, for the care and accuracy with which 

 all the directions given to them were carried out. 



SCIEN. FKOC. R.D.S. VOL. VI., PART IX. 2 T 



