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The Roman author Vitruvius gives explicit instructions on the construction of dewatering devices, and describes three variants of the "tympanum" in Chapter X of De architectura. It is a large wheel fitted with boxes, which in the first design, encompass the whole diameter of the wheel.
The remains of the Halsbrücke lift and the connecting section of the upper canal were restored in 1988. The tub boats used in this case were 8.5m long and 1.6m wide and when first used carried 2.5 tonnes, upgraded to 3 tonnes later in the canal and lift's working life. This lift worked until 1868.
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Ancient Roman units of area Roman unit English name Equal to Metric equivalent Imperial equivalent Description pes quadratus square foot 1 pes qu. 0.0876 m 2 0.943 sq ft scrupulum or decempeda quadrata 100 pedes qu. 8.76 m 2 94.3 sq ft the square of the standard 10-foot measuring rod actus simplex 480 pedes qu. 42.1 m 2 453 sq ft
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The line of sucker rods is represented in this diagram by the solid black line in the center of the well. A sucker rod is a steel rod, typically between 7 and 9 metres (25 and 30 ft) in length, and threaded at both ends, used in the oil industry to join together the surface and downhole components of a reciprocating piston pump installed in an oil well.
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