7 t o Mr. hutton’s Calculations to afcertain 
The correction for the thermometer is - 22 x — 
x 5897 = - 1*394, which being applied to the number 
above, there refults 5895,726; and this again being di- 
minifhed by its 7 g|^th part, or *327, there remains 
5895*399 feet, for the correct meafure of the bafe %y 
in the vale of Rannoch. 
There is no occalion here to explain the manner of 
meafuring thefe two bafes by the twenty-foot rods, as that 
has been very circumftantially done in vol. LXV. of the 
Phil. Tranf. for the year 1775, by the rev. Dr. maske- 
lyne, the learned and accurate conductor of this very 
important experiment. 
The following fhorter lines were alfo meafured as they 
happened to be wanted in different parts of the furvey. 
Ke = 94 10 
ke = 240 10 
ac ■=■ 99 
an - 7 10 
cn — 1 xi 
Feet. Inch. 
odd' = 269 
n n - 93 
ma - 7011 
mt - 68 3 
mp- 63 4 f not horizontal 
pt - 27 2 
The 
