476 MODERN STEAM PRACTICE . ary brass bushes , and has been a chief cause of the great success of the screw mode of propulsion . Without this wooden bearing surface solely lubricated by the sea water , it would be impossible ü £ 3 « J o W > … for ships to remain long on any Station without incurring constant expense in docking them to repair the bushes , as was required in the old method , where the action of the screw soon played sad havoc with the brass bushes , wearing them by repeated blows out of truth , and consequently shaking…
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