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Cooling Apparatus. The whole of the cooling apparatus is constructed of thinn [[thin]] sheet copper, the square foot of which weighs about 0.32 lb. It consists of a great number of small tubes through the interior of which the water passes; the outside of this tubes are kept cool by wetting them and by a current of air produced by bellows driven by the Engine In applying such a cooling apparatus only a very small quantity of water is required which continually circulates through the cylinder jacket & the cooling apparatus. Giging [[Giving]] now as follows the summary of my calculations, I am well aware, that as for the resistance of the balloon against the air & the effect produced by the screws, they only can be approximativly [[approximately]], but as the whole of my calculations are based on exact trials, made by Smeaton, of the resisstance of the wind, against a plan in right angle to its direction and with the aide of the experience we have of similar bodies moving in a similar element (ships in water) one may conclude with a great decree of certainity [[certainty]], the speed of the balloon will be as much
Transcription Notes:
Smeaton is a person; see https://books.google.com/books?id=XpyvPTRwLoQC&pg=PA361&lpg=PA361&dq=smeaton+and+balloons&source=bl&ots=EZPzVLO81w&sig=ACfU3U1n6ymz0lXwNYCA7j8ZhWNCTCP7zg&hl=en&sa=X&ved=2ahUKEwj30dfs9-XpAhXIct8KHc19DZ0Q6AEwBHoECAkQAQ#v=onepage&q=smeaton%20and%20balloons&f=false