Project of jet powered aircraft, 1864.
Triangular solid thin wing with 45° swept leading edge and straight trailing edge.
Cylindrical fuselage with conical nose and small tail plane.
Engine - pulse jet.
With all those features, "Delta" was at least 75 years ahead its time, so it hardly could be accepted by aeronautical society at the time of creation. It was an age of balloons and early gliders.
Both aircraft and engine were patented in France (1867)...
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