. Marine Engineer . g. It is an extremely simple matter to convert existingpistons to take a pair of Dexine buckets, as will beseen by reference to the adjoining diagram (Fig. 1),which represents the various stages. The first stepis to reduce the diameter of the plunger to Ty smallerthan the inside diameter of bucket. Then reduce thecentre portion of plunger to admit of a bearing surfaceof not less than f all round inside the buckets, whichis necessary to hold the buckets in position, andshould be even more than f if the plunger will admitit. Next turn up the intermediate ring to a diameterTV
. Marine Engineer . g. It is an extremely simple matter to convert existingpistons to take a pair of Dexine buckets, as will beseen by reference to the adjoining diagram (Fig. 1),which represents the various stages. The first stepis to reduce the diameter of the plunger to Ty smallerthan the inside diameter of bucket. Then reduce thecentre portion of plunger to admit of a bearing surfaceof not less than f all round inside the buckets, whichis necessary to hold the buckets in position, andshould be even more than f if the plunger will admitit. Next turn up the intermediate ring to a diameterTV less than the cylinder, and a thickness sufficient toallow the top and bottom plates to meet all except Tywhen they are mounted on the rod and screwed home ;it should never be more than xy, or in tightening upon the rod the buckets would be expanded sufficientto jam. In Fig. 2 we give a view of one of the largemills fitted with an 80 electric motor and installedat the works of the Dexine Packing and Rubber Co.,. properties, together with a valuable ability to resistthe action of extreme temperatures. It will beadmitted, we think, that it is not generally known Abbey Lane, Stratford, Essex. This view gives somesmall idea of the extensive plant necessary to manu-facture this material. i8 THE MARINE ENGINEER AND NAVAL ARCHITECT. August i, 1907. HYDRAULIC INSTALLATIONS. Messrs. Brown Bros. & Co., Ltd., of Rosebank IronWorks, Edinburgh, the well-known manufacturers ofsteering gears, reversing gears and hydraulicmachinery, supplied the hydraulic installations for thelarge new mail steamers of the Royal Mail SteamPacket Co., Southampton. in line with, the piston rods. One of the accompany-ing illustrations shows the piston and plunger withits valve boxes. The air, circulating, and feed pumps,are also driven direct from the engine crossheads. Alarge steam accumulator is provided, which gives awater pressure of 1000 lbs. per square inch, for work-ing the ten hydraulic cranes with w
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