Some time ngo we mentioned that the J. Trading Ca., Lil. were import-marins engine to been kerosene, ed and has been which was built by Boyd & Eu, expressly for it. This launelt in 27 feet long, with 5 feet 8 inches beam, 2 feet 8 inches deep and a draught of 22 inches. We have since been on" short trip in this launch called the Pee trolewm, the engine of which drives an 18 inch propeller. It is ® Shipman automatic steam engine manufactured by M. Cruickshank' of Peovidency, Rhode Inland, and la three horse power. Tt takes up very little room, not so much us is occupied by a couple of one on top of the other, he buller, which is full of tubes in which is the water, made of wrought iron, hero are two furnaces, if such they may be called, as they ure simply tubes into which are blown the flames which heat the water. Ihose flames, are formed by a pray of kerosene projected through the flame of a common vil amp, into the furnaces, causing an intense blast office, There is adiaphraym, akind of safety valve, which autumationlly regulates and controls the steam pressure, the fire also being regulated by it and it dove this in the following manner. As the pressure of steam riges in the boiler to the point at which the diaphragm has been set, the latter is gradually raised, carrying' with valve which automatically cute "tf the passage of steam to the wtowizers or apeay diffusers, and thus reduces the fuel supply. Coneequently there being only " sun all supply of kerosene projected into the furnaces, when there is x certain amount of steam, the flume is small ay that the steam is waintaived at the cequicod pressure, As the pressure is taken of, the valu is again released which congos ant increased apart of ay very r We had the steam guys up
a practical il of this ducing. the trip, for the steam having been allowed to run down, it jumped up from 40 Ibe. to 1LO lus, in two minutes, and at that it ree sined through theogony of the diaphraguy, The water supply is automatic, there bein; afloat in the tank, This float is connected with "rod which opens nnd closes " valve, oF cutting off the cupply of feed pump, as required. ted above, the fuel used is Kerosene, which owing to combustion, leaves little or no smoke, that the furnaces do not require to be cleaned, From one, to ove x & gallons of vil drive the engine for one hour, while a person with very liltls experience can attend to it satisfactorily. The boiler is cated in a jacket of sheet iron lined with asbestos felling which keeps the heat inside the boiler. Thy engine has a single cylinder, 3 inches in di with a stroke of 3 ch The exhaust steam is condensed and returns into the water tanks, of which there are two, one on each side vf the boat, ands pipe connects them at the bottom, so that there is always the same quantity of water in each tank and thus the buat is always in trim. On our trip, the run was [from the O. & J.
Trading Co.'s jetty to the " Point," a distance of about six miles this was accomplished in one hour, prau-tically against the tide Tue Shipman can be used for all manner of purport is perfectly sato from explosion,
Text read from the printed page and cleaned; old type leaves the occasional error.