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| | [No title] (Site not responding. Last check: 2007-10-08) |
 | | The key words in the Joconde database and a letter in the Dossier at Versailles strongly suggest that the map is linked with one of the major enterprises in 17th century France: the construction of the Canal du Midi by Pierre-Paul Riquet. |
 | | Rising 206 feet (63 m), via 26 locks, in its 32-mile (51.5-kilometre) journey to the summit of its route, it runs 3 miles (5 km) along the summit, then descends 114 miles (183.5 km) with a difference in elevation of 620 feet (189 m) taken up by 74 locks. |
 | | The engineer, Pierre-Paul Riquet, overcame a rocky rise near Béziers by a daring innovation, employing fl powder to blast a 515-foot (157-metre) tunnel, 22 feet (6.7 m) wide and 27 feet (8 m) high, the first canal tunnel ever so built, and the first use of explosives in underground construction. |
| www.leidenuniv.nl /fsw/verduin/stathist/huygens/acad1666/canal.htm (399 words) |
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