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.
Baldwin, Thomas
Aeronautics -- Early works to 1900; Balloons -- Early works to 1800
Also by winding up his Wheel, he might, if the Weather was moderate,
bring himself _down_ to the Grapple, which might be so contrived as to
_run down_ the Rope, and remain at the Bottom, by Means of a Knot, or
other Check.
He might also _loose_ his Grapple, and _rise_ again: or when down; pull
the Valve-Cord, and land.
298. 5. With a +second+ short Cable, snatch Block and Grapple, he woud
be able to _moor_ the Balloon, from which, he might, by procuring the
Country People to load the Car with fresh Ballast equal in Weight to
himself;—get out, and even leave the Balloon in their Care.
The Precaution of knowing whether he was over a fresh Water-Lake,
(for he might hear the Sea) might be useful in misty and low cloudy
Weather by Day, or during the Night; without expending Gass in the
_exploratory_ Descent.
298. 6. To facilitate the landing, the _Signal-Rope_ may be used to the
greatest Advantage, particularly in windy Weather; by _lowering out_
a Part, or the Whole, whether a Mile, or Mile and half, so that the
Grapple may take Effect on the Ground, at the Distance of its Length
_by Estimation_, _short_ of the Place where the Balloon is intended to
land.
As soon as the Grapple _holds_; it is in the Option of the Aironaut, to
tye Parcels of his Ballast _loosely_ round the Cable, to run downwards
along with it.
(For _which Purpose_, Iron-Rings with _Spring-Swivels_, which _open_
by _Pressure_ of the Fingers, and _shut_ of themselves, might answer
better than the _leathern Thongs_, as the former might be put, in _an
Instant_, round the Cable, and woud run down _quicker_.)
These Parcels of Ballast are to be sent down, in Succession, till
the Balloon has acquired such Degrees of +false levity+, as will be
sufficient to counteract that Tendency which the Wind will have to
_depress_ the Car of the Balloon forcibly on the Surface, so long as it
is connected with the Grapple _on the Ground_.
298. 7. When this Point is effected, the Balloon will remain suspended
in the Air; and being acted upon by the Wind, will be pressed into a
Direction approaching to an horizontal Line, in Proportion to the
encreasing Power of the Wind.
And here the Necessity of having the Cable fastened to a Center above
the Car, in order to retain its Perpendicularity, is most evident.
The Aironaut, in this Situation, may venture to wind up the Cable
_gradually_, and descend, to the Grapple.
Public-domain text, read in full here on John Shaqi.
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