The aerial age : a thousand miles by airship over the Atlantic Ocean; airship voyages over the Polar Sea, the past, the present and the future of aerial navigation (1911)
Wellman, Walter, 1858- · New York : A.R. Keller · leaf 180
all stresses. This added tensile strength isnot computed in the coefficient of 5 to 1. Xo means has as yet been found of making,with fabrics, an absolutely gas-tight reservoir.In varnished silk balloons, even when of two orthree tliicknesses of material, the loss rangesfrom ll/2 to 3 per cent… … BUILDING POLAR AIRSHIP 14 tightness. The contract called for an envelopefrom wliich the loss by leakage should not exceed11/2 per cent in 24 hours. The weights of the various materials enteringinto the construction of the huse balloon wereapproximately as follows: *e?* POUNDS. Fabric of the…
Aeronautics
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