( 110 ) 
The temperature within this water bath was not so regular and 
constant as that of the water in the experiment described in the 
Proceedings of May 25% ’01 (Comm. N°. 70, 1st continuation) as 
owing to the much greater height of the water bath, its difference 
in level with the mixing vessel was much smaller so that the water 
currents became much weaker. Moreover the piezometer tube was 
not in the water itself, but in the inner reservoir and it was 
impossible to stir the air in that enclosed space. To form a judg- 
ment of it I give here the temperature readings on April 5% 1900, 
the temperature of the room being 14° C. The thermometers were 
suspended against the piezometer tube, N°. 134 at the higher end 
near the small reservoir, N°. 135 in the middle against the steel 
flanged tube and N°. 29 at the lower end against the U-tube; the 
corrections of the thermometers have been applied. 
Thermometer. | Calculated 
Time. ee ee | mean | 
|| No. 134. | No. 135 | No. 29. | temperature. 
4.10 || 20°01 20°.07 20°.015 | _ 20°.03° 
4.25 || 200.04 209.05 20°.00 20°.02 
4.53 190.99 20°.03 19°975 | 19°,995 | 
| 5.07 190.98 | 20°.04 19°.975 | 190.985 
| a) | 
| 
Most days were however more favourable as for instance on 
May 7 1900. 
2.0 6 | 2 a | 9.22 
| | 
eve bi 
| 
| 
4.27 | 4.42 | 1.51 
3.51 | 4.06 | 4.19 
2.43 2.55 
| | 
nee 011200011 01, Ke 01 2°.02 pe ae 022 id war 4 
| 
I give here for one of the tubes viz. N°. IV, the results of the 
measurement of the normal volume; the volume is expressed in c.c. 
and the pressure in c.m. of mercury at Leiden. 
| Time. [2° 
| 
Mean temp. |/20°. in 20°. Ce 20° .01 
| 
