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MODERN STEAM PRACTICE.
it can also be applied for working the bridge should any accidentbefall the central lifting press. By means of two presses 20 inchesin diameter, one under each main girder at the tail end of the
bridge, the weight can be taken off the resting blocks at this point,and upon their removal the counterweighted end of the “bridge wouldsink down, raising the fore end clear off its bearings, and so allow-