382 



REPORT 1865. 



of the water at H and I was about the same. The 

 whole affair was then left for an hour or two, so that 

 it might become of the same temperature as the air of 

 the room. When the temperature had become the 

 same as that of the room, the water in the tube was 

 levelled with that in the bottle (exactness being 

 obtained by the use of a telescope moving in a hori- 

 zontal plane). The bottle was then marked in three 

 places at the level of the water, and when the gas 

 had been used, its amount was found by filling the 

 bottle to these marks (placing it so that the water 

 poured in was level with all three marks at the same 

 time), and measuring the quantity of water. 



To transfer the gas to the eudiometer for analysis, 

 the tube F was removed after the wire round the 

 rod D' had been tightened, and the bottle placed 



tubes CC were filled with 



upright ; the portions E E' of the caoutchouc 

 mercury, and the tube K of the tube and fun- 

 nel K L connected at E' ; mercuiy was then 

 poured into L, the tap N being open, when a 

 few taps caused the air in the tube to be 

 displaced by mercury, and on the wire at D' 

 being loosened, mercury flowed into the bottle ; 

 some little quantity was allowed to enter, and 

 then the wire at D' was tightened, and the 

 tube K and funnel removed. To the caout- 

 chouc tube C at E, a capillary tube P was 

 fitted, this tube being full of mercury, which 

 was kept in by a caoutchouc cap at S, and as 

 the gas was under pressure, on loosening the 

 wire at D it issued from the tube P. 



As soon as enough had come out, the wire 

 was tightened, and the bottle placed with its 

 mouth downwards so as to form a water joint. 



In each case of explosion with oxyhydrogcn 



gas, from 30 to 40 measures of the detonating 

 gas were added to 100 measures of the gas, or 

 mixture of air and gas. 



As each bottle was opened, from 200 to 300 cub. centims. of water entered. 



Bottle No. 2. 

 Fixed at 12 o'clock. 



Marked at 2 p.m. ; Therm. 64°-4 F. ; Barom. 30-04 inches. Contents up to 

 marks 1840 cub. centims. =1733 cub. centims. at 0° Cent, and 760 millims. 



577"7 in 45 seconds 



= 2310-7 cub. centims. per minute. 



1. 



Gas taken 380-867 ] 



After 15 minutes' contact with potash 367-711 V 



After 15 minutes' more contact 367'711 J 



After 16 hours' contact with potassic "I Q /"t nno m „„, * „*• „ ,, 



,, , l vSbrOOo =-19 per cent, oi oxygen. 



Diff. 13-156 = 3-454 

 per cent, of carbonic 

 acid. 



