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. The power from the waterwheel's crank would be in the form of a reciprocating backwards and forwards motion imparted to the flat rods. As all the pumping in this model was being done directly by the wheel, there would be the need for a balance weight to be applied to the reverse stroke of the rods. This would be applied both at the wheel and at the shaft collar, as it was important that the flat rods be kept under tension. The shaft collar arrangement would typically be in the form of an inverted T of timber construction known as a balance bob. It would have iron rods for reinforcement passing from the top of the upright, or king post, to the end of each outer beam. The end of one outer beam would connect to the top of the pump rod; the end of the other would carry the weight box, the end of the power train connecting to the top of the King Post, operating in a kind of see saw motion.
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