MONTGOLFIER Joseph-Michel de (1740-1810)

Lot 214
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Estimation :
7000 - 8000 EUR
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Result : 10 140EUR
MONTGOLFIER Joseph-Michel de (1740-1810)
Autograph MANUSCRIT with DRAWING, [1784]; 2 pages of one sheet in-4 mitered with an engraved portrait in a black morocco binding by Alix, slipcase. Superb and rare autograph manuscript on the principle and design of the parachute written by the famous inventor of the aerostat. First draft manuscript, overloaded with corrections, with a marginal note from the son Montgolfier: "This writing of Joseph Montgolfier, my father, being only a canvas had not been covered with his signature. [Having invented the hot-air balloon (1783), Montgolfier became interested in the development of the parachute [he made five successful attempts, launching a sheep from the highest tower of the Palace of the Popes in Avignon in 1784 (Gillispie, pp. 155-158); the first human jump was not made until 1797, by André-Jacques Garnerin). A body at rest can only acquire movement at the expense of that which is provided with it and communicates it to him. Thus if the parachute [...] contains 4 quintals of air it is visible that this mass of air can only be moved to reach the earth at the expense of the force that pulls it [...] consequently they must use in their fall three times as much time as if they were falling freely but this fall, even though 3 times slower, does not fail to have in proportion the same progression of speed as if it were free, which gives us a means of diminishing the shock of the home against the earth [....] It is visible that when the parachute descends the air it contains passes through the mesh of the net and gives a horizontal direction to the said parachute which is opposed to its opening consequently it receives at every moment new air at rest to which it combines the vertical movement and loses by this means a much greater quantity of the sum of its own. In addition, nothing is easier than the construction of this machine, which consists of a half globe of 12 feet radius made of silk cloth. One hundred alders are enough for its construction. From each spindle of this half globe a small silk rope extends which we will name suspantion ropes which all come to end around the upper circle of a wicker basket whose bottom is well padded inside and outside with mattress cloth. The ropes must start from the mouth of the parachute"... Etc. Montgolfier draws the parachute, with explanatory legends.
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