Note 133 — Chapter LXXVII

See

Section 375

. 2dly. If the Moiety,

Half-Heat

, or mean Temperature of the Air,

is equal

to the Standard-Temperature, to which the two Barometers are brought, by the 2d Table; the fourth Table, for

Expansion of Air

, is needless: the Height already found, in the 2d Table, being the

true

Height of the

upper Station

.

3dly. If the Moiety, Half-Heat, or mean Temperature of the Air, is less than the Standard-Temperature of 31°.24; subtract the mean Temperature from 31.24; and with the Remainder find the Expansion, as usual, by the 4th Table: subtract the Sum, (which is a corresponding Height in Feet and Tenths) from the Height in Feet and Tenths of the upper Barometer, at the Standard-Temperature, in the 2d Table: and the Remainder will be the true Height of the Mountain or upper Station. Section 384, Note a.