Reproduction by heliogravure of the figure from the Journal des sçavans (1678).

Extract from a letter written to Mr. Toynard on a Machine of a new invention to fly in the air.



A, right front aisle. — B, left rear aisle. — C, left front aisle. — D, right rear aisle. — E, fissure of the left foot which lowers the D aisle, when the left hand lowers the Aisle C. — F, fissure of the right foot which lowers the D-pin when the left hand lowers the C-pin.