CHAPTER LXXV.

PRACTICE OF THE SECOND EXAMPLE:

_With a distinct View of the Work. (Ph. Tr. for 1777, Page 579.)_

Section 386. The Point at which the Quicksilver stood in the Tube of the Barometer on the Mountain, or in the Car of the Balloon, being Inches 24.178 Tenths; its _attached_ Thermometer, Degrees 57.2 Tenths, and its Air-Thermometer 56°; while the Barometer on the Ground stood at Inches 28, .1318 Tenths; its _attached_ Thermometer, Degrees 61, .8 Tenths, and its Air-Thermometer 63°, .9; what is the Height of the _upper_ Station?

[Sidenote: 1st. Step.]

387. 1st. Step. Set down the Observation on the Ground, thus:

+Below+, Barometer, Inches 28, .1318 Tenths,

_Attached_ Thermometer, Degrees 61, .8 Tenths.

_Air_-Thermometer, 63°, .9.

[Sidenote: 2d. Step.]

388. 2d. Step. Set down the Observation, on the Mountain, or _in the Car_, thus:

+Above+, Barometer, Inches 24, .178 Tenths.

_Attached_ Thermometer, Degrees 57, .2 Tenths.

_Air_-Thermom. 56°.

[Sidenote: 3d. Step.]

389. 3d. Step. From the _warmer attached_ Thermometer, subtract the colder, thus:

61°, .8 57, .2 ——————— 4, .6

390. 4th. Step. Give the _colder_ Barometer the same Expansion, viz. 4°, .6 with the warmer, by the _first_ Table.