The forerunner of the current cargo crane was constructed in the form of a wood-construction that collapsed in1784. Built in order by Joseph I Adam, 4th Prince of Schwarzenberg in 1745. The crane, however, was no match for the force of ice, flooding and floating trunks. Johanns I Nepomuk, 5th Prince of Schwarzenberg ordered 1782-1789 a "crane in wood and stone" "with crane-arm, built by master builder J Michel. It served the stock turnover rate of the Main-ships on carts and wagons and vice versa, the crane was used until 1999. It is a cylindrical Rotunda (9.25 m in diameter and 9 meters high), in total 16 meters high, ochre color, round sandstones, with ten circular 30 cm high grouts. Round, flat conical roof (5.8 m tall without pilot burner, 40 ° slope, with roof window), consists of fixed bottom part and upper swivel coated with lead wooden tree with chain, ball and bottlehook (10 m in length and above, arm angle 50 °). Two meters above ground level perpendicular stone staircase on the West side, with curved door, above it the coat of arms of founder Prince Johann I Nepomuk of Schwarzenberg. To protect against the immense pressure from drifting ice and flood an icebreaker (shell limestone) was upstream connected with the outside.
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