(ads) 
division to the end of that imaginary tube and the mean “bore” 
is the volume divided by the reduced length. The best way to 
judge of the accuracy attained is by comparing the two calibrations 
I and II of tube J A: 
| E en Seca ER eed E 5 | Difference. | 
2 | Mark eee is 4. |.) bore: bore a= = 
| : marks. | length. | E IL L IL 33 L | iL. 
0.3 | 858.422 181.510 0.50650 | 0.50650 ‘0.00000 0.00000 | 
a 0.5 0.189 | 358.233 | 181.442 0.50649 0.50649 0 
b 1.8 1.297 | 356.936 | 180.783 0.50649 0.50649 0 
c 3.7 1.884 | 355.052 | 179.828 0.50649 0.50649 0 
4,0 | 0.299 | 354.753 179.682 0.50650 | 0.50649 — 1 
5.9 | 1.908 | 352.845 178.719 0.50651 | 0.50650 — 1 
d 6.2 0.303 | 352.542! 178.562 0.50650 0.50650 0 
—3.2 92.304 46.644. 0.50533 | 0.50530 — 3 
e |—2.8 0.395 | 91.909} 46.440 0.50528 0.50531 | + 3 
F 0.9 | 3.670 | 88.939] 44.592| 44.596 | 0.50535 | 0.50540 | 0.50537 + 2 |— 3 
g | 18.0 | 12.016 | 76.2238] 38.542 0.50564 0.50567| + 3 
h | 19.2 | 6.214 | 70.009| 35.424 0.50599 0.50605 |+ 6 
19.7 | 0.501 | 69.508 35.179 0.50612 | 0.50607 — 5 
# | 29.1} 9.319 | 60.189) 30.460 0.50607 | 0.50612 | + 5 
29.4 | 0.296 | 59.893 30.317 0.50618 | 0.50613 — 5 
j | 34.6] 5.150| 54.743] 97.716 0.5063 0 0.50630 0 | 
& | 42.1 | 7.378 | 47.365| 23.980 0.50627 0.50623|— 4 
42.3 | 0.195 | 47.170 23.877 0.50619 | 0.50622 + 3 | 
l | 48.8 | 6.402 | 40.768] 20.618 0.50575 0.50576 | + 1 | 
49.3 | 0.502 | 40.266 20.363 0.50572 | 0.50570 — 2 
al 2°3 | 2.964 | 37.302] 18.850 0.50533 0.50533 0 
The mean deviation for the total volume employed in the norma] volume 
1 1 
fi c = 
amounts to 350 350,000 | or the stem of the manometer tube to ooo’ 
this er result must be ascribed to the calculation of the 
volume of the meniscus and the use of the waterbath. (See proceedings 
June 24 1899, Comm. N° 50, plate II, fig. 4). 
