American military balloon unit inflating a reconnaissance balloon with hydrogen (1862). The balloons used were of varnished silk and, in spite of a small amount of leakage, they still retained sufficient gas to make ascents some days after their initial inflation. Engraving from 'Astra Castra' by Hatton Turnor (London, 1865).

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American military balloon unit inflating a reconnaissance balloon with hydrogen (1862). The balloons used were of varnished silk and, in spite of a small amount of leakage, they still retained sufficient gas to make ascents some days after their initial inflation. Engraving from 'Astra Castra' by Hatton Turnor (London, 1865).

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Size: 3200px × 1912px
Location:
Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., amount, ascents, astra, balloons, castra, days, engraving, gas, hatton, inflation., initial, leakage, retained, silk, small, spite, sufficient, turnor, varnished