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The next great ascent took place at Milan, on the 25th of February, 1784, under the direction of the Chevalier Paul Andriani, who had a balloon constructed by the Brothers Gerli, at his own expense. We read that this balloon was 66 feet in diameter, and that the envelope was composed of cloth, lined in the interior with fine paper.
The fire was lighted under the machine, at first with dry birch-wood and afterwards with a bituminous composition, ingeniously concocted by one of the Brothers Gerli. In less than four minutes the balloon was completely inflated, and the men employed to hold it down with ropes perceived that it was on the point of rising. The aeronauts then gave the order to let go.
He must give his attention to the master's sketch books, those studies in chalk, in tempera, on thin canvas and paper, prepared for the stylus or the pen, which Vasari calls the final triumphs of designing, and of which, in spite of the loss of many of his books, the surviving specimens are very numerous. Some are easily accessible in Gerli, Chamberlaine, and the autotype reproductions.
In the Royal Collection at Windsor there are anatomical drawings for the construction of an imaginary quadruped with gigantic claws. The bony, muscular, and venous structure of its legs and feet is accurately indicated. See the drawings engraved and published by Gerli in his Disegni di Lionardo da Vinci, Milan, 1784. Vasari is the chief source of these legends.
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