We live in an age of balloonacy. Only a few weeks ago I sent you the account of M. Nadar and his 'Géant,” “the greatest balloon in the world;” now M. Eugène Godard has built an 'Aigle,' by the side of which the 'Giant' is a mere dwarf.
Source: wiktionary
Horace Walpole was severe on this new whimsy of balloonacy, which was only chilled, not extinguished, by De Rosière's catastrophe.
Source: wiktionary
In the milder case of "balloonacy" the enthusiast proposes essentially a modernized Hindenburg (8 million cu ft). In the most virulent form of the disease, however, the victim calls for fleets of 100 million cu ft helium whales.
Source: wiktionary