TRIAL OF THE NEW JACKSON JET BOAT EVOLUTION. The new boat of Dr. W. M. Jackson called the Evolution propelled in a peculiar manner namely by means of a very small water jet under a very high pressure went on a trial trip on the 9th inst. in New York harbor and is reported as operating very well although on this occasion she came far short of attain ing the great speed anticipated by her owners. The propulsion of vessels by means of the hydraulic or wa ter jet is a very old system dating back nearly to the year 1700 since which time it has been tried in various forms by different inventors
TRIAL OF THE NEW JACKSON JET BOAT EVOLUTION. The new boat of Dr. W. M. Jackson called the Evolution propelled in a peculiar manner namely by means of a very small water jet under a very high pressure went on a trial trip on the 9th inst. in New York harbor and is reported as operating very well although on this occasion she came far short of attain ing the great speed anticipated by her owners. The propulsion of vessels by means of the hydraulic or wa ter jet is a very old system dating back nearly to the year 1700 since which time it has been tried in various forms by different inventors earliest among whom in the application of steam power to the system were Rumsey 1787 who had a fifty-foot jet boat on the Potomac which made three to four miles an hour. Subsequently the celebrated James Watt was an ex perimenter in the same line. Many others have made essays and a few vessels of considerable size have been tried the same principle of propulsion being employed namely the drawing in of a water supply at any conve nient part of the boat and the expulsion of the same in the form of a jet at the stern of the vessel. By the use of the water jet the mechanism needed for correct plan was to use a very small jet of water under a very high pressure. To carry out this idea in 1887 he fitted up a small boat named the Primavista of % tons displacement. She was provided with a ten inch Worthington simple duplex pump a Roberts tube boiler of about 50 h. p. The water jet discharged at the stern was only a quarter of an inch in diameter. The water was expelled under a pressure of 690 lb. to the square inch and the boat is stated by parties in terested in selling the stock of the company to have attained a velocity of ten miles per hour. The alleged success of the Primavista satisfied Dr. Jackson that he had 'struck ile' in the matter of steam navigation and under the guidance of an able Wall Street stock pro moter a company was formed with a view to the building of a new vessel la
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