GASEOUS, COMBUSTION AT HIGH PRESSURES. 



283 



(E). The Standard Bourdon Pressure Gauges. 



Three standard pressure gauges, of the Bourdon type, made by Messrs. Schaffer and 

 Budenberg, Ltd., of Manchester, registering up to 30, 60, and. 90 atmospheres, 

 respectively, were used during the research to measure the pressures of the original 

 mixtures fired, and of the cooled products after an explosion. These gauges were 

 re-standardised at frequent intervals during the research by direct comparison against 

 a mercury column at the makers' factory. The installation also includes three other 



A ZO LITRE qAS HOLDEf 



B. COMPetSSINS CVLINOEff 



C. STORAGE VESSEL 



D. 3 WAV CONED VALVE 



L 100 ATMOSPHERE BOURDON 



F. COMPRESSING PUMP 



AND WATER- 



Fig. 9. 



Bourdon gauges, each registering up to 100 atmospheres, for ascertaining the pressures 

 in the various storage cylinders at any time. 



(F). Diagram and Plan of the Installation. 



The general arrangement of the installation will be understood from figs. 9, 10, and 

 11, respectively, which show diagrammatically, the relation of its various parts, and 

 the plan of the experimental table and its connections. Fig. 9 shows, in elevation, 

 the arrangement for compressing the gases into their respective storage cylinders. 



VOL. CCXV. A. 2 P 



