CHAPTER V. 



PRESSUEE. 



Instruments and methods. 



Barometers. — The following table shows the barometers used on the expedition and their 

 corrections as determined at Kew before leaving England. 



Table 90. 



Barometers. 



Owing to the danger of air entering the barometers during the journey and before they 

 could be set up at the land stations, the two Fuess barometers were taken, because with 

 these instruments it is possible to detect and correct for any air which might enter. These 

 barometers are not, however, convenient for general use, it was therefore intended to use 

 them only for checking the Kew barometers, which were to be used for taking the actual 

 observations. 



.Just before the Terra Nova left Lyttleton, in New Zealand, all the barometers were set up 

 in a room on shore and compared. About twelve readings of each barometer were taken, and 

 the results were compared after each reading had been corrected for temperature and instru- 

 mental error as determined at Kew. As it is impossible to say that any one of the instru- 

 ments had undergone no change, the difference is given in table 91 between the barometer 

 shown at the end of each line and the one shown at the head of the column. 



Table 91. 

 BaronKter Comparison in Lyttleton. 



