935 IRON SHIPBUILDING . DOUBLE DREDGER OF 45 HORSE - POWER . This is a very simple arrangement of dredger , the pinion on the engine shaft gearing with a spur wheel on the tumbler shaft over - head . The hoisting gear is placed between the engine and the … Fig . 670 . — Double Dredger of 45 horse - power . Longitudinal and Transverse Sections . a , Dredge boat . b , Boiler , c , Engine . D , Tumbler shaft . e , Bücket ladder . f , Hoisting blocks . G , Hoisting drum . boiler ; the shaft for carrying the hoisting drum is of large diameter , fitted…
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