Snellen chart. A wall chart developed by a Dutch ophthalmologist Hermann Snellen in the 19th century, which is still used today to measure visual acuity. It consists of 11 lines of block letters of decreasing size, which are to be read at a distance of 6 metres (20 feet).
See bridge in maps. Pont de Normandie is a cable-stayed road bridge that crosses the river Seine and contect Le Havre to Honfleur in Normandy, in France. The bridge was designed by Michel Virlogeux. Construction began in 1988 and the bridge was opened in January 1995.
The Pont du Gard (literally bridge of the Gard ) is an ancient aqueduct in the South of France constructed by the Roman Empire. It was originally part of a 50 km (31 miles) canal supplying fresh water to the Roman city of Nimes. The Roman aqueduct was constructed entirely without the use of mortar.