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 :. | Small devotional picture by Verrocchio | Study fur the Sforza monument | The muscles of arm, shoulder and neck | Study fur the communion | Portrait of a Musician dey |
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Alexandre Roslin
1718-1793
Carleton E.Watkins
American photographers , b. 1829, d. 1916 was a noted 19th century California photographer. Carleton Emmons Watkins was born in Oneonta, upstate New York. He went to San Francisco during the gold rush, arriving in 1851. He traveled to California with Oneontan Collis Huntington, who later became one of the owners of the Central Pacific Railroad, which helped Watkins later in his career. His interest in photography started as an aide in a San Francisco portrait studio, and started taking photographs of his own in 1861. He became interested in landscape photography and soon started making photographs of California mining scenes and of Yosemite Valley. He experimented with several new photographic techniques, and eventually favored his "Mammoth Camera," which used large glass plate negatives, and a stereographic camera. He became famous for his series of photographs and historic stereoviews of Yosemite Valley in the 1860s, and also created a variety images of California and Oregon in the 1870s and later. Watkins purchased the 1860s Central Pacific Railroad construction stereoview negatives from CPRR official photographer Alfred A. Hart and continued their publication through the 1870s. However Watkins was not a good businessman. He spent lavishly on his San Francisco studio and went deeply in debt. His photographs were auctioned, following a business setback, resulting in his photographs being published without credit by I. W. Taber, the new owner. Watkins also had problems of his photographs being reprinted without permission by Eastern companies and with other photographers rephotographing the exact scenes Watkins photographed. In 1879, Watkins married his 22-year-old assistant, Frances Sneade, with whom he had two children. Watkins began anew with his "New Series," which included a variety of subjects and formats, mostly related to California.
Poet Nizami
1141-1209