Italian High Renaissance Painter and Inventor, 1452-1519 Florentine Renaissance man, genius, artist in all media, architect, military engineer. Possibly the most brilliantly creative man in European history, he advertised himself, first of all, as a military engineer. In a famous letter dated about 1481 to Ludovico Sforza, of which a copy survives in the Codice Atlantico in Milan, Leonardo asks for employment in that capacity. He had plans for bridges, very light and strong, and plans for destroying those of the enemy. He knew how to cut off water to besieged fortifications, and how to construct bridges, mantlets, scaling ladders, and other instruments. He designed cannon, very convenient and easy of transport, designed to fire small stones, almost in the manner of hail??grape- or case-shot (see ammunition, artillery). He offered cannon of very beautiful and useful shapes, quite different from those in common use and, where it is not possible to employ cannon ?? catapults, mangonels and trabocchi and other engines of wonderful efficacy not in general use. And he said he made armoured cars, safe and unassailable, which will enter the serried ranks of the enemy with their artillery ?? and behind them the infantry will be able to follow quite unharmed, and without any opposition. He also offered to design ships which can resist the fire of all the heaviest cannon, and powder and smoke. The large number of surviving drawings and notes on military art show that Leonardo claims were not without foundation, although most date from after the Sforza letter. Most of the drawings, including giant crossbows (see bows), appear to be improvements on existing machines rather than new inventions. One exception is the drawing of a tank dating from 1485-8 now in the British Museum??a flattened cone, propelled from inside by crankshafts, firing guns. Another design in the British Museum, for a machine with scythes revolving in the horizontal plane, dismembering bodies as it goes, is gruesomely fanciful. Most of the other drawings are in the Codice Atlantico in Milan but some are in the Royal Libraries at Windsor and Turin, in Venice, or the Louvre and the École des Beaux Arts in Paris. Two ingenious machines for continuously firing arrows, machine-gun style, powered by a treadmill are shown in the Codice Atlantico. A number of other sketches of bridges, water pumps, and canals could be for military or civil purposes: dual use technology. Leonardo lived at a time when the first artillery fortifications were appearing and the Codice Atlantico contains sketches of ingenious fortifications combining bastions, round towers, and truncated cones. Models constructed from the drawings and photographed in Calvi works reveal forts which would have looked strikingly modern in the 19th century, and might even feature in science fiction films today. On 18 August 1502 Cesare Borgia appointed Leonardo as his Military Engineer General, although no known building by Leonardo exists. Leonardo was also fascinated by flight. Thirteen pages with drawings for man-powered aeroplanes survive and there is one design for a helicoidal helicopter. Leonardo later realized the inadequacy of the power a man could generate and turned his attention to aerofoils. Had his enormous abilities been concentrated on one thing, he might have invented the modern glider.  Related Paintings of Leonardo Da Vinci :. | Detail of Madonna of the Rocks | Portrait of a Lady at the Court of Milan (san05) | Madonna of the Rocks | Cartoon | The Virgin of the Rocks |
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Samuel J.Reader
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Charles Christian Nahl and august wenderoth
German-born American Painter, 1818-1878 American, 1819-1884
Cornelis Bol
Dutch, born circa 1589-1666,Painter, etcher and draughtsman, active in London. He was probably from a family of painters originating in Mechelen who later settled in Antwerp. Bol and his wife were members of the Dutch Church in London in 1636. An etching of an Action between the Dutch and Spanish Fleets (Oxford, Bodleian Lib.) is signed and dated 1639, and a set of etchings by him after Abraham Casembrot ( fl c. 1650-75) includes a view of Lambeth Palace as well as four imaginary Mediterranean seaports. A signed drawing of the Blockhouse at Gravesend is in the British Museum, London. George Vertue saw at Wotton House, Bucks, 'three views of London from the River side Arundel House Somersett house Tower Lond. painted before the fire of London by Cornelius Boll: a good free taste'. They were probably commissioned by John Evelyn, the diarist, around 1660 and descended in the Evelyn family. Their attribution to Bol is confirmed by a signed version of Somerset House (London, Dulwich Pict. Gal.). Although Bol was only moderately accomplished, he was able to reproduce the distinctive light and character of the River Thames and to render the riverside and its landmarks with much topographical detail; his pictures make pleasing visual documents. The handling of the naval craft is identical in a small signed oil panel of an Action between Dutch and Spanish Ships (Amsterdam, Rijksmus.) and in other marine subjects that have appeared in London salerooms. According to Immerzeel, Bol was still working in London at the time of the Great Fire in 1666.