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Airopaidia : $b Containing the narrative of a balloon excursion from Chester, the eighth of September, 1785, taken from minutes made during the voyage; hints on the improvement of balloons ... To which is subjoined, mensuration of heights by the barometer, made plain; with extensive tables. The whole serving as an introduction to aërial navigation.Baldwin, Thomas

History

Airopaidia : $b Containing the narrative of a balloon excursion from Chester, the eighth of September, 1785, taken from minutes made during the voyage; hints on the improvement of balloons ... To which is subjoined, mensuration of heights by the barometer, made plain; with extensive tables. The whole serving as an introduction to aërial navigation.

Name: Airopaidia : $b Containing the narrative of a balloon excursion from Chester, the eighth of September, 1785, taken from minutes made during the voyage; hints on the improvement of balloons ... To which is subjoined, mensuration of heights by the barometer, made plain; with extensive tables. The whole serving as an introduction to aërial navigation.
Author: Baldwin, Thomas

Baldwin, Thomas

Aeronautics -- Early works to 1900; Balloons -- Early works to 1800

|25 |.06325 |.06575 |.06850 |.07100 |.07350 |.07600 |.07850 |.08100 |
  |26 |.06578 |.06838 |.07124 |.07384 |.07644 |.07904 |.08164 |.08424 |
  |27 |.06831 |.07101 |.07398 |.07668 |.07938 |.08208 |.08478 |.08748 |
  |28 |.07084 |.07364 |.07672 |.07952 |.08232 |.08512 |.0879  |.09072 |
  |29 |.07337 |.07627 |.07946 |.08236 |.08526 |.08816 |.09106 |.09396 |
  |30 |.07590 |.07890 |.08220 |.08520 |.08820 |.09120 |.09420 |.09720 |
  |31 |.07843 |.08153 |.08494 |.08804 |.09114 |.09424 |.09734 |.10044 |
  |32 |.08096 |.08416 |.08768 |.09088 |.09408 |.09728 |.10048 |.10368 |
  |33 |.08349 |.08679 |.09042 |.09372 |.09702 |.10032 |.10362 |.10692 |
  |34 |.08602 |.08942 |.09316 |.09656 |.09996 |.10336 |.10676 |.11016 |
  |35 |.08855 |.09205 |.09590 |.09940 |.10290 |.10640 |.10990 |.11340 |
  |36 |.09108 |.09468 |.09864 |.10224 |.10584 |.10944 |.11314 |.11664 |
  |37 |.09361 |.09731 |.10138 |.10508 |.10878 |.11248 |.11618 |.11988 |
  |38 |.09614 |.09994 |.10412 |.10792 |.11172 |.11552 |.11932 |.12312 |
  |39 |.09867 |.10257 |.10686 |.11076 |.11466 |.11866 |.12246 |.12636 |
  |40 |.10120 |.10520 |.10960 |.11360 |.11760 |.12160 |.12560 |.12960 |
  +---+-------+-------+-------+--------+-------+-------+------+-------+


             _The 5th Step, applied in the first Example._

364. Add this, to the former Expansion, thus:

            Inches 25.19 Tenths
  with 4° on  25     .0101 Expansion
  with 4° on .19     .0000076 Expansion
               ——————————————
The Answer is 25.2|001076, viz. the Point at which the Quicksilver woud
stand, in the coldest Barometer, when equally _expanded_, i.e. of the
same Temperature with the warmer. Reject all but the first Decimal as
too minute: this is seen by a Line drawn between the first and second
Decimal.

Practice will shew how far to proceed, without computing the decimal
Parts of an Inch, to more than 4 Places; but it is always more exact,
to follow minutely the above Rules.




                            CHAPTER LXXII.


Section 365. Having therefore understood the Foundation, Construction,
and Use of the first Table; in the present Case, having also added the
decimal Parts of an Inch just found, for the Expansion,—to the Inches
and Tenths, expressing the colder Barometer; which will then have the
_same Expansion_, or _Temperature_ with the warmer, thus;

  Inches.
    25.19    _colder_ Barometer:

      .0101  Expansion _on_ the same, in Parts of an
             Inch with 4° of Temperature, (rejecting
             all but the first Decimal as too
    ———————— minute,)
    25.2|001 added; this Sum will express the
  Point at which the Quicksilver in the colder Barometer
  woud stand, when equally expanded, i.e.
  in the same Temperature, with the warmer.

366. 6th Step. Place both Barometers, now of _equal_ Temperature with
the warmer, together, first, the _upper_ Barometer; and under it the
_lower_, thus:  Inches 25. 2 Tenths.
                       29. 4

                        END OF THE FIRST STAGE.

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