iyo 



TRANSPIRATION AND ASCENT OF SAP ch. 



Table 19. 



Calibration of Thermocouple. 



No. of 

 Sol. 



8" 



f-l 



o 



O 



-' - 



go* 

 3^ & 



a 



o 



CD 

 ft 



I. 



II. 



III. 



IV. 



V. 



VI. 



gill. 



3*500 



3-000 

 2 500 

 2-000 

 1-500 

 1-000 



Observation II. 



480 

 449-3 

 417 

 383-0 

 349-0 



22-8 



58-3 



92-8 



124 



153-3 



317-0 187-3 252-1 64 



251 4 



253-8 

 254-9 

 253-5 

 252-1 



228 

 J 05 

 162 

 129 

 97 



No. of 

 Sol. 



I. 



II. 

 III. 

 IV. 



V. 

 VI. 



u . 

 S 



- j +a 



So ? 



PjrH ? 



ft 



Observation III. 



gm. 



500 



ooo 



500 

 000 

 500 

 000 



s. 



O 



fa 



480-5 

 449 -0 

 418-0 

 383-6 

 340-0 

 317-0 



Ol ' 'xi 



o 



fa 



56 



93 



124 



154 



187 





 (I 

 5 

 

 

 3 



CD 



n: 







CD -* 



CD 



qa 



CD w 

 CD 



o 'g 



fa o 



iffa 



^ 



CD ? 



251 

 252 

 255 

 253 

 251 

 252 



22S 

 196 

 162 

 129 

 H7 

 65 



228-4 

 196 2 

 162-2 

 129 6 

 97 6 

 64-9 



2060= 

 1-768 3 

 1-474= 

 1181 

 0-886= 

 0-596 3 



It will be noticed from the numbers recorded in the 

 table that the position of the zero shifted considerably 

 during the observations. In the first series, i.e., those on 

 Solution I, the zero point lay about 251 on the scale, 

 while during the first observation on Solution II it was 

 near 254, These shifts of zero show the importance of 

 being able to reverse the current, and of obtaining the 

 deflection by two readings, one on each side of the zero 

 position. 



A graph of these observations is given in Fig. 26 (p. 161). 

 The ordinates correspond to the concentrations of the solu- 

 tions, and the abscissa? to the measures of the deflections 

 in mm., caused by the difference in temperature of the 

 freezing-points of the solutions and that of water. The 



