( 769 j 
Ty DE eats ea ee ee 
If also we call the number of centimeters at which the mercury 
stands above the zero point at the reduced reading y, and note that 
WS OOo AE 
we have 
TABLE IL. Constants O, Series V 
U, = 10,3676 cc ares Oe | 
U, = 0,0380 cc BAO 
Mi Ui ~ 06075, ce 
P= 20156) ce 
U, = (0,29286 y + 0,0005 42) ce 
| 
V, = 613,450 ec | 
| v! 0,637 ce per cm. | 
The small values of V, in this series was due to the breakage 
of the graduated tube l,. In Series IL V4 was about 6.2 cc. in 
Series III and IV about 4.8 ce. 
- In Series II as in Series V the small piezometer was about 10 ce., 
in Series III about 20 cc. and in Series IV about 5 ce. 
The thermometers are all compared from time to time with a 
Standard corrected at the Reichsanstalt. 
I 
§ 12. The determination of the normal volume. 
The temperature t; of the piezometer in the constant temperature 
bath was determined as a mean of three read on different thermo- 
meters placed at various heights, their corrected difference was 
not allowed to exceed 0.05 deg. C. The temperature of the stcel 
capillary’ was determined by a thermometer placed at about its 
middle point. These thermometers together with those used for the 
temperatures of the baths surrounding b4 and f, were all divided 
into 20ts of degrecs. In the following table the readings for one 
determination are given, in column A the reading of the level of 
the cathetometer, B that of the scale, C the temperature of the 
barometer, D that of the large water bath at the top the middle a 
the bottom, E and F those of the water baths round 4, and f, G 
that of the steel capillary (in this example it was not read, the 
temperature taken being that of the top thermometer of the barometer). 
