( 38 ) 
given mark; for this I have taken @ = 0,0001814; to determine 
the volume I took the specific gravity s = 13,5953 and to 
reduce the volume of the glass tube to 20° C. a = 0,0000277, 
according to a determination with a similar reservoir after the method 
of the weight thermometer. The following table gives a determination 
of the volume from the cock to the different marks for one tube 
(1 A); in this table a, b, and c refer to the calibration of the U- 
tube fastened to the large reservoir, d to the volume of the large 
reservoir, m to the volume of the small reservoir and x to the cock- 
piece sealed on to the tube before the calibration. 
| : | Drawn off | Mercury | Meat | Density | Volume Pa i 
3 | mercury. | in the tube. sas | mercury. | mercury. Pat 20°C. 
a | 84834 2515,202 | 8.05 | 13,5755 | 185.275 185.333 
b 13,0174 2506,718 8.03 55 184.650 184.707 
c 17,1082 2493,701 8.07 54 183.692 183.749 
d 1793,582 2476,593 7.65 65 182.418 182.477 
e 24,9947 683,011 7.78 61 50.310 50.326 
ye 81,963° 658,016 7.99 56 48 .470 48 .485 
g 42,3604 576,053 8.59 41 42.437 42.450 
h 67,8204 533,692 8.62 41 39.317 39.328 
i 36,5242 465,872 8.68 39 34.321 34.331 
51,1626 429,348 8.71 39 31.630 31.640 
45,4437 378,185 8.79 37 27.862 27.870 
l 24,333! 332,741 8.17 51 24.511 24.518 
m 254,968 308,408 8.70 39 22.721 22.727 
n 53,440 | 53,440 8.57 | 42 $.937 | 3.938 
In order to obtain the volume of the two menisci, we avail our- 
selves of the bore of the tube, as it is found approximately by 
equalising the menisci. This approximate bore is given in the follo- 
wing table. (For the distances between the marks compare the table 
referring to them on p. 36). 
From the table in Communication N°. 67, § 9, we can easily 
derive another which gives the volume of the meniscus expressed 
by its height and the bore of the tube. And so we can put down 
