370 New Apparatus for impregnating Liquids with Gas. 
The pendulum was now taken down to remeasure the distance 
between the knife edges, in order to ascertain whether or not they 
had suffered from use. 
_ The pieces A, a, B and b, being applied as before, the follow- 
ing measurements were taken. 
Distance from A to a, 329-06 divisions. 
B to b, 366-97. 
' | Readings of the Micrometer. | Divisions 
TG DS YR ia SE ae Sas ee a Se 2 2 
| Atoa. | Btob. | Scale. +39-4 in. 
97..| 39:0 | 630°0 | 953-66 
June EO) 37-3" ~|-630°0 955-86 
25th.| 10:0 | 36:5 | 630-7 955-46 
The pieces made to change places. 
| 26th. | 59-0 87:0 | 680-0 955-01 
| 59-0 84:0 | 680°3 956°81 
51-0 750 | 671-0 955°51 
43:0 | 67:7 | 664°5 «| 957-16 
415 | 680 | 6625 955-76 
Mean of the whole | 955-65 : 
Hence the distance between the knife edges is 39°4 inches 
~ 4955-65 divisions of the micrometer. 
{To be continued. ] 
LVIII. Description of a new Apparatus for impregnating 
Liquids with Gases. By A CorrEsponDENT. 
\ To Mr. Tilloch. 
Sir, — Mosr chemists have to lament the extreme fragility of 
Wolfe’s apparatus ; and setting aside its expense, it appears to 
me to be very defective, as the surface of the gas which is ex- 
posed to the absorbing fluid is very small, on account of its being 
suffered to pass through so small a depth of fluid in large bubbles ; 
when, on the contrary, it ought to be divided, and to pass through 
as great adepth of fluid as possible. To effect this, the ends of 
the retort, a fig. 6, (Plate III.) of the long conducting tube J, 
should be closed, and perforated with a number of very small 
holes *. By this means almost every atom of gas is brought into 
contact with the fluid in ascending the long cylindrical vessel c; 
which might easily be made to turn on its axis with a small de- 
gree of eccentricity, which upon the whole would produce a much 
greater effect than if it had passed through half a dozen of Wolfe’s 
bottles, 
* Or perforated platina caps might be fixed on. 
Might 
