END OF THE LAST STAGE.
Rule copied.

384. The rule underneath, consisting of 3 Precepts only, is laid down by Sir George Shuckburgh, in the Transactions for 1777, Page 574, in order to ascertain the Height of Mountains, &c. (See Section 349).⁠[127]

1st. Step, in Section 353.

385. Recapitulation for each Step of the Work, in the first Example; referring to the Sections.

2d. Step, in Section 354.

Below. Barometer, Inches 29, .4 Tenths.

Attached Thermometer, 50 Degrees, Air-Thermometer 45°.

3d. Step, in Section 355.

Above. Barometer, Inches 25, .19 Tenths.

Attached Thermometer 46°, Air Thermometer, 29°​1⁄2.

From 50°
 subtract
46
——
and there remains 4
 Degrees of Temperature to be added to the colder Barometer.
4th Step, in Section 356.

By Means of the first Table, find the Expansion of the colder Barometer, with Degrees of Heat, viz. 4° on Inches 25, .19, gradually, thus:

5th Step, in Section 364.
6th Step, in Section 366.
with 4° on 25. = .0101
with 4° on .19 = .0000076
—————————
25.2|
Upper Barometer, Inches 25, .2 Tenths.
Lower Barometer, 29, .4
End of the first Stage.
7th Step, in Section 368.

By Means of the 2d Table, find the corresponding Heights in the Air, at 31°. 24.

8th Step, in Section 371.
25, .2
Answer
 6225.0
29, .4
 2208.0
———
The Remainder is
 4016.8 Height in Feet, &c.
9th and 10th Steps, in Section 373.

The 3d Table, or Table for Heights in the Atmosphere corresponding to the Tenth of an Inch on the Barometer, including the 9th and 10th Steps, is useless in this first Example.

End of the Second Stage.
11th Step, in Section 376.
Detached Air-Thermometer, above,
29​1⁄2
Ditto below,
45°
——
Whole Heat
2)84​1⁄2
Half Heat or mean Temperature
43​1⁄4
Deduct Standard
31​1⁄4
———
Moiety above Standard
11°
12th step, in Section 377.
By Means of the 4th Table, find the
Expansion of Air, with 11° on
4106.8
 Feet
viz.
107.3
———
which added to the same Height gives
4124.1
 for the
true Height, in English Feet, of the Mountain, or upper Station, sought.
End of the last Stage.