THOUGH the airship is not infrequently described as a lighter‐than‐air craft, the usual meaning attached to the phrase obscures the fact that the vessel, having on occasions to fly cither in the heavy or the light condition, is nearly as dependent as the aeroplane on forces of dynamic origin.
Teed, M.P.L. (1931), "Airships in Horizontal Flight: An Examination of the Complicated Forces that Come into Play when an Airship is Pitched", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 5, pp. 107-108. https://doi.org/10.1108/eb029395
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