trigonometrical measurements at Spitzbergen. 30 9 
Note. London , 1824- During a residence at Drontheim, 
in Norway, in the autumn of 1823, 1 had occasion to employ 
the same two barometers in measurements of heights, and I 
made, in consequence, the following comparisons of their re- 
spective indications, at times when the height of the mercury 
was very different : the results are in remarkable correspon- 
dences with those at Spitzbergen, in page 299, and may be 
considered an additional justification of the employment of 
the two index corrections on that occasion. 
Newman’s. 
29.130 
3°' 2 54 
Jones’s, 
29.091 
30.128 
Index correction. 
4- .183 
+ -i9 6 
