304. Mr. Cavallo has favoured the British Nation with a cursory tho’ clear Account of the same, in his “History of Airostation:” a Continuation of which it were to be wished he woud likewise publish annually.
305. It might contribute greatly to the Improvement of the Art; if Mr. Faujas woud give Engravings on a large Scale, of the different Machinery, already used or invented to direct the Balloon, with their Proportions: particularly the moulinet of Blanchard: as well as that lately tried by Messrs. Auban and Vallet; whose Machinery is still more distinguished and effectual.
306. The Titles and Sizes of all useful Books written on the Subject, also the Places where they are to be had, might likewise be inserted, at the End of each annual Volume.
307. The principal Defects of the British Balloons are, in
1. The Construction.
2. Production of Gass.
3. Mode of Direction, and
4. Security of landing.
First, Defects of the Construction are both in the Form, and Composition.
The Form ought to be that of a right[101] Cylinder,[102] by which the Capacity is doubled without encreasing the Resistance: ending above and below, each in a Hemisphere. A cylindrical Trunk, 2 Feet in Diameter, being added to convey the Gass into the Balloon; and suffer it to escape, when too much expanded in the etherial Regions.