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THE MaRINE REVIEW 55 VERTICALENGINE eee a UXF OS V sy | FinesBirce Pune 6 local ARRANGEMENT SHOWING ASH EXPELLER 'DRIVEN BY GEARING, COMPRESSOR NOT BEING SHOWN, AS SAME CAN BE PLACED WHERE MOST has fully disposed of the matter in the most satisfactory way, as the fol- lowing extract from a letter written by the superintendent engineer of the Van de Stoomvaart-Maatschappij, Ned- erland, to the makers will testify: "Upon the arrival of the ship at Am- sterdam she was placed in dry dock and her bottom was carefully exam- ined with the view to ascertaining whether any scoring had taken place owing to the expulsion of ashes be- neath the water line. I have to in- form you, however, that no marks whatever were to be observed, neither has there been any trouble with the suction, nor with the propellers or propeller shaft." 'In addition to this the chief engi- neer of the Nieuw Amsterdam assured the writer that when this vessel was docked after the expeller had been in use for over six months he carefuly examined the bottom, but could find no sign of erosion, pitting or scour- ing, with the exception that a little paint about the size of his hand had been rubbed off the plates immediate- ly in the way of the ash discharge pipe. Had a ring been fitted round CONVENIENT. this opening the bottom would have been untouched. No signs of ashes were found in the inlets or stern tube bearings. This proves conclu- sively that the force of the com- pressed air does carry the ashes com- pletely clear of the bottom of the vessel, as already stated. Plate 7 shows the arrangement of the expeller as same will be installed in the stokeholds of the new battle- ship North Dakota. In this case com- pressed air is supplied by a Westing- house compound compressor, the ex- peller being driven by an ordinary, small, vertical engine. There will 'be four expellers in all in the above vessel and a similar num- ber in her sister, the United States battleship Delaware. The appliance has also been adopted by the British navy, and is being fit- ted in the three new battleships now building of the St. Vincent class. The expeller possesses a special ad- vantage in the case of war vessels, the importance of which can hardly be estimated. It leaves no trace behind it, whereas, if ashes are dumped over the side in calm weather, it shows on the surface 12 hours afterwards.. There are just two more very recent inventions to which I would like to make hurried reference. | The first of these is a device for cooling state rooms in vessels trad- ing in the tropics and fitted with re- frigerating machinery. The second has for its object the maintaining of electrically heated state rooms at a definite temperature irrespective of atmospheric conditions. The cooling device consists of a pipe about 8 in. in diameter and 5 ft. long. The lower end of this pipe has oblong openings about 4 in. deep, 'so arranged round the bottom as to form-a grid for admission of air; in- side the pipe is a brine coil supplied from the refrigerator, anc on top of the pipe is a small centrifugal fan driven by a little motor placed on a bracket to one side of the pipe and discharging into the state room. On starting the fan the air is drawn in through the openings at the bottom of the pipe over the brine coil and through the fan back into the room at a considerable reduced tempera- ture. By this means the state room