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Gerhard, Ivan Kondratyevich ( Johann - Konrad) (1720–1808), an engineer, privy councillor.
Gerhard, Ivan Kondratyevich ( Johann - Konrad) (1720–1808), an engineer, privy councillor. He was born in Germany (Schwabia) and he got the elementary education there after that he learned at the Academy of Sciences in St Petersburg
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Water supply system of Tsarskoye Selo
Water supply system of Tsarskoye Selo; the water supply system of Tsarskoye Selo Town (Detskoye Selo Town, Pushkin Town) and Pavlovsk Town . In the middle of the 18th cent. the water supply system designed by P
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