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:

CHAPTER I.

Introduction.

Section 1. THE Public have, for a considerable Time, been entertained with Accounts of aërial Voyages.