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Berlin Sept 4th. 1883

Approximate Figures
To generate gas for balloon with acid and a metal = Fe + H2SO4 = FeSO4 + H2.
Proportion [[strikethrough]] 1 H2 H [[/strikethrough]] of 1 of H2SO4 to .7 of Fe
Takes 23 times the weight of Fe, and 49 times the weight of H2SO4 to make 1 of H.
1 cu ft H = 2.43 grams, 700000 cu ft H = 1,701,000 grams [[divided by symbol]] 451 (grams in lb avoirdupois) = 3771, total wt H.
Same amount of air at 14 times heavier = 52794 lb avoirdupois  Would take 86,733 lbs Fe to make 7000000 cu ft H which at 8.02 lb = $1734.66 for Fe (scrap Fe).
Would take 184,779 lbs H2SO4, which at $.04 per pound = $7391.16
700000 cu ft coal gas at $2 per 1000 = $1400.
Experiment with refining coal gas.
" " [[dittos for Experiment with]] deriving H from water ^[[by electricity]] each cubic centimeter of which contains 1 1/4 liter of H.  See Barkers College Chemistry under H.
One pound of H burning will raise the temperature of [[strikethrough]] 1 lb H2O. [[/strikethrough]] 50,000 lbs H2O, 10. Haswell 569
One lb C = 14500 lbs H2O raised 1 [[degree symbol]]

Transcription Notes:
a system of weights based on a avoirdupois = pound of 16 ounces or 7,000 grains, widely used in English-speaking countries.

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