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Smiles gives the following epitome of some of those pressing at this stage: Various trials of pipe-condensers, plate-condensers and drum-condensers, steam-jackets to prevent waste of heat, many trials of new methods to tighten the piston band, condenser pumps, oil pumps, gauge pumps, exhausting cylinders, loading-valves, double cylinders, beams and cranks all these contrivances and others had to be thought out and tested elaborately amidst many failures and disappointments.