- A flying machine is an aeroplane (qv).
- A dirigible balloon (or just dirigible) is an airship (qv).
- An aeroplane is the wing of a flying machine (qv).
- Airship collectively describes both flying machines and dirigible balloons (qqv).
Get it? (Got it.) Good!
Seriously, I'm glad the meanings of these words were rationalised within a few years: what a head-ache it would be to have constantly qualify them all through my thesis!
Sources: R.P. Hearne, Aerial Warfare (London and New York: John Lane,
1909); Fred T. Jane, ed, All the World's Air-ships (Flying Annual)
(London: Sampson Low, Marston & Co., 1909).
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