Italian High Renaissance Painter and Inventor, 1452-1519 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 :. | Lady with the ermine | Madonna with the Yarnwinder | The Virgin and Child with St Anne (detail) f | Anatomical drawing of the stomach and the intestine | Annunciation (detail) st |
Related Artists:
Eduardo Rosales Gallinas
Spanish , Madrid, 1836 - Madrid, 1873
Olof Arenius
a Swedish portrait painter, and son of a minister in Upland, was born in 1701. He studied under David von Krafft, and afterwards went to the Netherlands to study the old masters. His portraits and miniatures in oil are much esteemed, and are to be found in all the public galleries, as well as in the best private collections, in Sweden. Many of them have been engraved. He died at Stockholm in 1766.
James Monroe
(April 28, 1758 - July 4, 1831) was the fifth President of the United States (1817-1825). Monroe was the last president who was a Founding Father of the United States, and the last president from the Virginia dynasty and the Republican Generation. His presidency was marked both by an "Era of Good Feelings" a period of relatively little partisastrife and later by the Panic of 1819 and a fierce national debate over the admission of the Missouri Territory. Monroe is most noted for his proclamation of the Monroe Doctrine in 1823, which stated that the United States would not tolerate further European intervention in the Americas. Born in Westmoreland County, Virginia, Monroe fought in the American Revolutionary War. After studying law under Thomas Jefferson from 1780 to 1783, he served in the Continental Congress. As an anti-federalist delegate to the Virginia convention that considered ratification of the United States Constitution, Monroe opposed ratification, claiming it gave too much power to the central government. Nonetheless, Monroe took an active part in the new government and in 1790 he was elected to the Senate, where he joined the Jeffersonians. He gained experience as an executive as the Governor of Virginia and rose to national prominence when as a diplomat in France he helped negotiate the Louisiana Purchase in 1803. During the War of 1812, Monroe held the critical roles of Secretary of State and the Secretary of War under President James Madison. Facing little opposition from the fractured Federalist Party, Monroe was easily elected president in 1816, winning over 80 percent of the electoral vote. As president, he sought to ease partisan tensions and embarked on a tour of the country. He was well received everywhere, as nationalism surged, partisan fury subsided and the "Era of Good Feelings" ensued. The Panic of 1819 struck and dispute over the admission of Missouri embroiled the country in 1820.