Cheboksary Reservoir (Russian: Чебоксарское водохранилище, Chuvash: Шупашкар шыв усравĕ) is an artificial lake in the central part of the Volga River and formed by the Cheboksary Dam in Novocheboksarsk.

A surface area of Cheboksary Reservoir is 2190 km², max width is 16 km, max depth is 35 m.

The largest cities on the Reservoir are Nizhny Novgorod, Cheboksary and Kozmodemyansk.

Coordinates: 56°18′00″N 46°42′53″E / 56.3°N 46.71472°E / 56.3; 46.71472

Cheboksary (Russian: Чебокса́ры; Chuvash: Шупашкар, Šupaškar) is the capital city of the Chuvash Republic, Russia and a port on the Volga River. Population: 453,645 (2010 Census preliminary results); 440,621 (2002 Census); 419,592 (1989 Census).

A satellite city of Novocheboksarsk is located about 6 kilometers (3.7 mi) east of Cheboksary.

Cheboksary was first mentioned in written sources in 1469, when Russian soldiers passed here on their way to the Khanate of Kazan. According to archaeological excavations, however, the area had been populated considerably earlier. The site hosted a Bulgarian city of Veda Suvar, which appeared after Mongols defeated major Volga Bulgarian cities in 13th century. During Khanate period the town is believed by some^[who?] to have had a Turkic (probably, Tatar^{[citation needed]}) name Çabaqsar and that the current Russian and English names originate from it. However, in maps by European travelers it was marked as Cibocar (Pizzigano, 1367), Veda-Suar (Fra Mauro, 1459). Shupashkar, the Chuvash name literally means the "fortress" of the Chuvash.

André-Eugène Blondel (28 August 1863 – 15 November 1938) was a French engineer and physicist. He is the inventor of the electromechanical oscillograph and a system of photometric units of measurement.

Blondel was born in Chaumont, Haute-Marne, France. His father was a magistrate from an old family in the town of Dijon. He was the best student from the town in his year. He went on to attended the École nationale des ponts et chaussées (School of Bridges and Roadways) and graduated first in his class in 1888. He was employed as an engineer by the Lighthouses and Beacons Service until he retired in 1927 as its general first class inspector. He became a professor of electrotechnology at the School of Bridges and Highways and the School of Mines in Paris.

Very early in his career he suffered immobility due to a paralysis of his legs, which confined him to his room for 27 years, but he never stopped working.

In 1893 André Blondel sought to solve the problem of integral synchronization, using the theory proposed by Cornu. He determined the conditions under which the curve traced by a high-speed recording instrument would follow as closely as possible the actual variations of the physical phenomenon being studied.