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10 MARINE REVIEW. Double Plate Planing Machine. A front and a rear view of a plate planer constructed by the Niles Tool Works of Hamilton, O., is presented herewith. This company recently furnished two machines of this design for the United States government, one of them for the Boston and the other for the League island navy yard. The machine consists essentially of a heavy box bed, at either end of which are at- tached uprights joined by the heavy steel box beam seen at the top. Jackscrews placed under this beam and upon the sheet hold the latter firmly in place while being planed. The beam overhangs, permitting the planing of sheets of any length by re- setting. At one end of the main bed is pivoted ashorter bed, upon which is fitted a saddle for planing the end of the sheet at the same setting. This bed may be adjusted by rack and pinion movement 10 degrees either way froma right angle. It rests upon a heavy slotted table, which is at the floor line. In its ad- justing movement, the bed carries with it a slotted table ona level with the main bed, the end of the sheet being secured to this. I] | i ii 7 | ay Ly e The tool saddles are moved by powerful screws which are supported along their entire length to prevent deflection. 'The main saddle has two tools and cuts in both directions, one of these tools having an angular movement the same as an ordinary planer, while the other moves in a horizontal plane only. There is one tool only in the butt planing saddle, and the cutting is done in one direction. The saddle is, therefore, provided with quick return movement. 'There is a safety device which avoids the possibility of a collision between the tools. Should both saddles approach the corner of the sheet simultaneously, the main saddle reverses the motion of the other, and no harm can result. 'Tappets attached to rods automatically reverse the sad- dles by shifting open and crossed belts. The machine, of course, enables sheets to be planed much more accurately, as well as much more expeditiously, where the ends are to be planed square or at an angle, than can be done on a single plate planer. As will be seen, the machines are of very * knots. rigid construction throughout, and they are built for the heaviest work, those furnished the government being adapted to plane plates 1% inches thick, 24 feet long, at one setting, and 6 feet wide. The Latest Addition to the Navy. The Raleigh, the first war ship of the new navy built com- plete by the government in the U.S. navy yards, was launched at Norfolk last week. She is 300 feet on the load water line, 42 feet beam and her normal draft is 18 feet. Her estimated cost is $1,642,915 anda premium of $50,000 was offered for each additional quarter knot over 19 and the same deduction was to be made for speed deficiency, but all bids were in excess of the appropriation and the secretary of the navy was authorized to have them built at government yards. She will have two sets of engines working twin screws. It is estimated that her engines will develop 10,000 indicated horse power at full power, with a steam pressure of 160 pounds. . This will drive the ship at twenty Her coal supply at normal draft will be 400 tons, the bunkers will hold 675 tons and with this supply she can steam FRONT AND REAR VIEW OF A PLATE PLANER. 1500 miles at full power, or 10,500 at 10 knots, her most economi- cal speed. The engines are of the triple expansion vertical, inverted, direct acting type with two low pressure cylinders. | Her cylinders are 36, 53, 57 and 57 inches in diameter, with a common stroke of 33 inches. Steam is supplied by four double ended boilers, and two single ended ones to be used as auxil- laries. The grate surface is 597 square feet and the heating surface 19,382. 'The closed ash pit system of forced draught will be used. The condensers have each 7,000 square feet of cooling surface. The revolutions at full power will be 164. Capt. 'Thos. Ross, steamer Chas. Macalester, Washington oF CF writes a friend who sends him the Ryvrrw: "Am greatly obliged to you for the favor of the REviEW. Weare framing the supplements as they come and are making a regular gallery of our office.