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Airopaidia

Chapter 144: PRACTICE OF THE SECOND EXAMPLE:
By Thomas Baldwin
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About This Book

The work presents a first-person account of an 18th-century balloon voyage launched from a regional town, pairing vivid descriptions of aerial scenes with practical instruction. The narrative records observations made during ascent and flight and is accompanied by engraved views; it also offers proposals for balloon design and a method of inflation by steam, precautions against descent over water, and inquiries into atmospheric conditions affecting direction. A clear, practical explanation of measuring height with the barometer is included, together with extensive tables. The material functions as an introduction to aërostatic navigation that mixes travel narrative, natural-philosophical observation, and engineering advice.

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?

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.

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°.

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.