GASEOUS COMBUSTION AT HIGH PEESSURES. 



285 



(fig. 14). Full details as to the experimental procedure in such a case will be found 

 in the section of the paper referred to. 



(H). Gas Sampling and Analysis Arrangements. 



Samples of the orginal mixture fired, as well as of the exploded products in each 

 experiment were drawn off, through one of the coned valves of the particular 

 explosion bomb used, into tubes over mercury, and were subsequently analysed over 

 mercury in an apparatus embodying the Franklancl-McLeod principles specially 

 designed by Prof. BONE for rapid and accurate work.* 



The whole of the installation described under the preceding Sections A to D, 

 inclusive, as well as the recording manometer and the chronograph used in the pressure 

 experiments described hereafter in Part VII., were made by Mr. C. W. Cook, of 



C 



Fig. 12. 



Fig. 13. 



Manchester, from designs kindly furnished by Prof. J. E. PKTAVEF,, F.H.S., to whom 

 the authors desire to express their obligations. Figs. 12 and 13 (showing the 3- way 

 coned valve), 14 (the manometer), and 15 (the chronograph), appeared in the memoir on 

 " The Pressure of Explosives : Experiments in Solid and Gaseous Explosives," published 

 by Prof. PETAVEL in the ' Philosophical Transactions' in 1905, t and are only reproduced 

 here for the sake of completeness. Fig. 2 (the compression pump) also appeared in a 

 later paper published by Prof. PETAVEL in 19084 



The two bombs, A and B, used by the authors (figs. 4 and 5) are similar in design to 

 those shown on pp. 368 and 370 of Prof. PETAVEL'S first memoir (lac. cit.), but differ 

 from his in dimensions, internal capacities, the arrangements of the valves, and the 

 position of the firing plug. 



* 'Proceedings Chemical Society,' 1898, vol. 14, p. 154. 

 t ' Phil. Trans.,' A, vol. 205, pp. 357 to 398. 

 I ' Physikalische Zeitschrift,' vol. IX, p. 75. 



2 P2 



