Chapter IV: Section 13: )

12. Article 1. A portable Barometer,[2] with a common Syphon or
Bulb, (purchased at Lausanne.)

12. 2. Martin’s Thermometer,[3] with Farenheit’s Scale[4] for the
Degrees of Temperature.

12. 3. Mariner’s Compass in a double Box, to be used when the
Sun is intercepted from the View by Clouds, in order to discover
whether the Balloon turns round.

12. 4. Down, or small Feathers, to be loose in the Pocket, and
thrown out, when enshrined in Clouds; or at any other Time, to shew
the Rise or Fall of the Balloon.

12. 5. An Asses’ Skin Patent Pocket-book; as Wet spoils Paper.

12. 6. Two _red_ Lead Pencils: each Pencil ready pointed at both
Ends, to save Time and Trouble: preferable to Ink, which may be
spilt or frozen.

The Strokes with _red_ Lead are not so easily obliterated, as when
made with a _black_ Lead Pencil.

12. 7. A small sharp Knife pointed, and ready open, or which will
open easily. A Pair of Scissars.

12. 8. A _wicker_ Bottle of Brandy and Water, only three Parts
full, half and half: such Bottles are more secure: and such Mixture
will not soon freeze. The cochuc or elastic Bottle is still better.
A Cork-screw.

12. 9. _Compact_ Provisions, which do not soil the Fingers or
Pocket-book, as Confectionaries, Fruit, Biscuit, Bread.

12. 10. A _boarded_ Map of the Country over which the Aironaut may
be supposed to pass: the Back serving as a Table.

12. 11. Two Needles with large Eyes: the _raw_ Silk put through,
and tyed on a Knot at the Ends to prevent the Needles from being
lost: to be ready at the Instant wanted, to sew up any Holes within
Reach, in the Balloon; the Holes being first tyed up with Twine.

The Needles to be stuck into Parchment, containing a small Hank of
_raw_ Silk: the Needle Silk run round the Parchment, to keep the
Hank dry.

The whole Hank to be tyed by one End to the Side of the Car; when
above all Clouds, to shew, by the Divergency of the Threads, the
Electricity of the Air.

12. 12. A few Yards of Dutch Twine, loose in the Pocket, to tye the
Neck of the Balloon in descending.

12. 13. For easy Experiments; 1st, Dutch Twine, half a Mile long,
on a Reel, or Pulley, or two Lengths on different Reels: also
to each Reel a Flag, made of white Linen, a Yard square; and
stretched by a slender Lath; one Side of the Flag being bound and
stitched round it: also a Piece of Twine, two Yards long, is to be
fastened by its Ends to the Ends of the Lath: a Loop is to be made
in the Middle of the Twine: and to the Loop is to be applied round
the Middle of the Lath another Piece of Twine, which will prevent
the Lath from being bent; and will keep the Flag always stretched.

By this Apparatus, Observers from below may be enabled to estimate
the Height of the Balloon, as will be shewn in its proper Place.

12. 14. 2dly, To try the Density of the Air, at different Heights,
_above_ the freezing Point with Water; _below_ it, with Brandy.

In a Basket take two Pint-bottles, one full of Water, the other
of Brandy; and six or eight empty ones: also a small Metal
Tunning-dish.

Let one End of a String be tyed round the Neck of each Bottle: and
the other End sealed to the Top of a large Cork much tapered, to
enter the Mouth easily. Round each Neck, tye a Parchment Label,
large enough to contain in abbreviated Characters the Number of
the Bottle; Time of Observation, Heights of the Barometer and
Thermometer, while on the Ground.

When an Experiment is made in the Air; pour off a full Bottle into
an empty one: put the Cork into the emptied Bottle, and mark again
the Time, Barometer and Thermometer: which are to be compared
with an Eudiometer below, to discover the Rarity and Purity of the
Atmosphere.

12. 15. A third white Linen Flag, made as above, and tyed to the
upper Hoop of the Balloon, so as to hang in Sight, will give Notice
of a Change in the Wind.

12. 16. A Yard of thin Ribbon, two Inches broad, tyed to the lower
Hoop, will mark the Rise and Fall Of the Balloon.

(12. 17. A Magnet and Iron Filings in a thin Pewter Dish with a
Cover; Also

The Prism and large Telescope were left, as too heavy.) And the
Sextant or Quadrant coud not be procured in Time. They woud, have
been of little Use, as no Horizon of the round Earth was seen
during the Excursion: and it is presumed, that the circular Horizon
is seldom visible, when the Balloon is at any considerable Height;
the Accumulation of Vapour between the Eye and Horizon preventing
it: tho’ such Vapour remains invisible to Spectators from below.

12. 18. Eight Bladders, each above half blown, and differently
coloured for Ornament, tyed round the _upper_ Part of the Car,
Breast high when the Aironaut stands upright: in Case the Balloon
fall into Water.

12. 19. Speaking Trumpet: also a live Pigeon, in a small Basket of
Matting.

12. 20. Pepper, Salt, Ginger; to try the Effects of Tastes, which
have been said to become insipid on the Peak of Teneriffe.