Study and translation project for Bourcart's invention of 1866.  Translations per clip image are invited from AWE workers having mastery of French. Thanks.
http://www.energykitesystems.net/BOURCART1866/index.html  is THIS PAGE
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Si les centres de gravité et de surface se confondent, le tout peut aller dans tous les sens. 
FIRSTEFFORT: "If the centers of gravity and surface merge, the whole can go in all directions."
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Si le centre de surface est au-dessus et à côté du centre de gravité, sans être éloigné, le tout abandonne finira toujours par prendre une direction oblique, qui pourra être maintenue et même relevée par un battement d'ailes. Si le centre de gravité est très-loin du centre de surface, on aura un parachute.
FIRSTTRANSLATIONEFFORT: 
If the center of surface is above and adjacent to the center of gravity, without being distant, the whole abandoning will always take an oblique direction, which can be maintained and even raised by a flapping of wings.
If the center of gravity is very far from the surface center, we will have a parachute.   [[Comment: Given the diagram, it seems as though the author might have intended to say, "if the center of gravity is far below the surface center, then we would have a parachute situation available. ~JpF]]
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