TABLE OF CONTENTS

AN ACCOUNT OF THE PLATES; WITH DIRECTIONS FOR PLACING THEM.

1st. An Account of the Plates.

1. (a) A Circular View from the Balloon at its greatest Elevation, ([Page 58].) The Spectator is supposed to be in the Car of the Balloon, suspended above the Center of the View: looking down on the Amphitheatre or white Floor of Clouds, and seeing the City of Chester, as it appeared throu’ the Opening: which discovers the Landscape below, limited, by surrounding Vapour, to something less than two Miles in Diameter.

The Breadth of the blue Margin defines the apparent Height of the Spectator in the Balloon (viz. 4 Miles) above the white Floor of Clouds, as he hangs in the Center, and looks horizontally round, into the azure Sky.

2. (b) The Balloon over Helsbye-Hill in Cheshire, at half past II. on Thursday the 8th of September, 1785. ([Page 78].)

It is seen in the South-west-Quarter.

The View was taken in a high Field, at the End of Sutton-Causeway.

Helsbye-Hill, tho’ upwards of 600 Feet high, appeared from the Car of the Balloon, to be on the same Level with the Grounds below.

3. (c) A Balloon-Prospect from above the Clouds, ([Page 154,]) or Chromatic View of the Country between Chester, Warrington and Rixton-Moss in Lancashire: shewing the whole Extent of the aërial Voyage; with the meandering Track of the Balloon throu’ the Air.

4. The Explanatory Print (d), ([Page 155]:) which elucidates the former by giving the Names of the principal Places mentioned in the Excursion.

N. B. The Circular View is seen to the best Advantage, when placed flat on a Table or Chair, and rather in the Shade: the Eye looking directly down upon the Picture.

Whoever will be at the Trouble of viewing distinct Parts of the Balloon-Prospect, throu’ a very small Opening, made by rolling a Sheet of Paper into the Form of a hollow Tube, and applying it close to either Eye, at the same Time shutting the other; or by looking throu’ the Hand, held a little open, and close to the Eye; may form a very accurate Idea of the Manner, in which the Prospect below was represented gradually in Succession, to the Aironaut; whose Sight was bounded by a Circularity of Vapour, as in Section [79], [221].

2d. Directions for placing them.

Place the Top of the circular view, even with the Top of the Page.

The Plate will then lye over at the Bottom, and at the right Side of the Page.

Fold the Bottom up into the Book, even with the Margin: and the right Side in like Manner.

Observe to place the Bottom of each of the other Plates, even with the Bottom of the Page.

The Plate will then lye over at the Top, and at the right Side of the Page.

Fold the Top down, into the Book, even with the Margin: and the right Side, in like Manner.

The circular View, to face Page 58.

The Balloon over Helsbye-Hill, to face Page 78.

The Balloon Prospect, to face Page 154.

The explanatory Print, to be placed on Page 155: and, when unfolded, to be seen along with the Balloon-Prospect.

Literal and other Errors proper to be examined, and corrected with the Pen, before the Book is read.

Page.
6.[Note [1]—ειαδεν write ευαδεν.
18.[Note [6]—Cube of the Velocity, &c. write (as in some Copies) Square of the Velocity, &c. the Resistence will be as 3✕3=9.—See Chambers’s Dictionary, under resistence.
23.Section 21. Blot out [Signs] of Currents.
26.Before All Things being thus prepared, insert [Section] viz. 25.
35.Line 13.—I o’Clock, write I. o’Clock.
54.Section 52.—an Extent above them of 77 Miles, write an Extent of 102 Miles. See the Occasion of this Mistake in [Note [18] Calculation SECOND, which makes the Answer 102 Miles, 1 Quarter, 320 Yards; and the Ans. to the
PROBLEM being 102 1 307
——————————
gives the Prospect 13 Yards
less than that over the Clouds.
84.Line 4.—great Turnpike-Road, write great public Road.
84.[Note [26] After See Moore’s Practical Navigator, insert See Page 98 [34].
98.After [Note [34] add See Section 84, Note [26].
118.Line 5.—from a vertical Situation only, to be seen, write to be seen from a vertical Situation only:.
174.Line 1.—excessine Diminution write excessive Diminution.
177.Line 9.—contain write contains.
202.The Sections 259, 260, 261, are repeated.
234.Line 6.—a Yard, write two Yards.
236.Line 3. After the Words in Danger of breaking; add the Bottom of the Balloon must be opened, or the upper Valve drawn. And erase the Remainder of the Sentence.
237.Line 4.—which is a Sign that the Balloon descends, write (which is a Sign that the Balloon descends).
242.Line 21.—supercede, write supersede.
263.Line 5.—commonly: ascend, write commonly ascend:.
266.Line 21.—their Passage write its Passage.
271.Line 14.—each 4 Feet write each 4 Inches.
278.Lines 15 and 18.—third Tables and third Table, write fourth Tables and fourth Table.
283.[Note [119].—more than the three first Decimals write more than the four first Decimals.
288.Line 5. After .0000076, insert which, being divided by .1, gives a Cypher less.
288.Line 11.—with 4° on .25, write with 4° on 25.
290.[Note [120]—at low Water.) write at low Water.
292.Line 23.—there will remain the greater Height, write there will remain, secondly; (see Section 367) the greater Height.
303.Line 6.—(viz. the 8,) write (viz. the .8,).
309.Line 10. Marginal Note.—7th Step in Section 366. write 7th Step in Section 368.
310.After Line 23, insert Air-Thermom. 56°.
311.Line 1.—By the Practice of the first Example, write Practice of the second Example.
312.Line 29. After The Answer, &c. insert, made by rejecting a Cypher,.
317.Before the last Line but two, insert end of the first stage.
318.Line 23.—the 2d Tenth, write the 1st Tenth.
319.Line 13.—, gives 7. write, gives 97.
322.last Line but two.—and the remaining Feet write the remaining Feet.

AIROPAIDIA: