The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

in mahogany, and the lounge and en- trance hall in polished teak. A new feature in the second class accommo- dation is a large deck shelter, which must add greatly to the comfort of the passengers in cold or stormy weather. In their degree the third class passengers have also been lib- erally dealt with, both in their din- ing saloon and sleeping quarters, the latter being excéptionally large and airy, while the former is nicely fin- ished in polished ash. There is ac- commodation altogether for 2,200 pas- sengers, of whom 500 are first and ' 500 second class. The Mauretania's turbines and boil- ° ers, with coal bunkers, occupy a total length of from 400 to 450 feet amid- ships, with a depth from the main deck to the double bottom. The coal bunkers along the sides of the ship are so arranged that they will' afford protection to the most vital and im- portant parts of the vessel if used as a scout or cruiser in time of war. For the same reason the principal machinery is placed below the water line of the ship. Two high-pressure and two. low-pressure turbines are provided, each having a separate shaft and each driving one propeller. The total power developed is about 65,000 to. 70,000 I. HH: P.; so'that each of the Mauretania's four propellers exerts nearly 24 times the power of the pad- dle steamer Britannia, the first Cun- ard steamer. Throughout the machinery of the new vessel, including the steering gear and engines, has as far as pos- sible been duplicated, so that in~-the event. of accident she cah always be worked by one set of engines. When the engines are running the rotating mass in the engine rooms weighs 600 tons, and this weight revolves at about 200 RB. PM: So ereat is the accuracy necessary in the con- struction of turbine machinery that the whole must be under control arid measurement to the one-thousandth patt of an inch and balanced to an ounce. which form the low-pressure turbine casings weigh 38 tons each. The weight of the ingots from which the large drums were forged was 120 tons each. About 1% million blades have been fitted in the turbine machinery, and if these blades were placed end 'to end they would extend a distance of about 110 miles. Steam is supplied by 23 double- ended and two single-ended~ boilers, having 192 furnaces in all. Aira is supplied to the boilers by Howden's system of forced draft, the fans being Some of the larger castings - TAE Marine. REVIEW driven. by -electric motors.. If. the boilers, which 'are arranged in the ship in four stoke holds, were placed on end one above the other °* they would form a column 547 ft, high, or about 1-10. of a mile. The. four elliptical funnels rise 152 ft. above - the keel of the vessel. If placed on their sides they would form an e- liptical tunnel inside of which two locomotives of the ordinary type could pass each other. On the occa- sion of the launch of the Mauretania the vessel's funnels lay on the ground end to end, and many of the visitors were driven in motor. cars through the tunnel thus formed, which had a total length of. 430 it. (Lunchton could be taken in one of the funnels by 250 persons comfortably seated at tables. The coal necessary to drive the Mauretania across the Atlantic is very great. It is. computed that for a trip from Liverpool to' New York and back about 20 trains, each of 20 cars, would be required to transport the 'amount of coal that the vessel would need for the journey. The Mauretania was built by the firm of Swan, Hunter & Wigham Richardson. . The = ship. yard. where the vessel was constructed is on the site of the ancient Roman stronghold of Segedunum, which existed from about the year 280 A. D. to about 400. Segedunum marked the eastern- most end of the great wall, built by the\Romans, and which spanned Brit- ain from the Solway to the Tyne. During excavations in the Wallsend ship yard shortly before the laying of the keel of the leviathan a por- tion of the wall was uncovered, and many coins and other proofs of the occupation of Britain's ancient con- querors were unearthed.: LENGTH OF A KNOT. Editor Martine Review:--Just for a little information, I note in your is- sue of Nov. 7, over signature of "En- gineer," that a knot or nautical mile equals 6,080 ft. As I have been. taught that a statute knot is 6,082.66 ft., and is considered the standard, the number of feet in a statute knot being arrived at thus: The circum- ference of the earth is divided into 360 deg., each degree containing 60 knots or (360 X 60) 21,600 knots to the circumference, 21,600 divided into 131,385,456, the number of feet in the earth's circumference-- gives 6,082.66, ft, the length of a statute knot. J. W. WEstcotTtT. Detroit, Mich., Nov. 9. 31 LAUNCHING THE MAUNA KEA. The Mauna Kea, the fifth steamship | built 'on the Pacific coast for the In- ter-Island Steam Navigation Co. of Honolulu, was launched at the Union . Iron Works, San Francisco, on Mon- day, Nov. 4. She was christened with a bottle of champagne by Miss Bea- trice Frear, daugther of H. P, Frear (naval architect of the Union Iron Works) and niece of Gov. Frear of the Hawaiian islands. The Mauna Kea will ply as a first-class passenger ship between Honolulu and Hilo. She is a sister ship of the Helene, the Maui, the Kaluilani, and the Liki Liki, all of which were built by the Union Iron Works for the same company. The keel of the new vessel was laid nine months ago and she will be ready for her trial trip in about six weeks. She will be turned over to her owners about New Year's day, 1908. The dimensions of the Mauna Kea are: Length water line, 240 ft.; beam, 36 it: dranueht, 16 16° 6 im. Sie a4 "equipped with engines of 220 H. P,, which are guaranteed to give her a speed of more than 16 miles an hour. She will be' fitted up with all the auxiliary equipment and _ accessories found in vessels of her-class. J.J. Tynan, general manager, and Robert Johnson, foreman carpenter, superin- tended the launching, which was wit- nessed by John A. McGregor, presi- dent ef the Union Iron Works; Mrs. McGregor, Miss McGregor, Mr. and Mrs. H. P. Fréary Mes, | J) Tynen Miss Margaret Tynan, W. A. Johnson, W. H. Evans, D. H. Fairchild, J. Me- Candles and Mr. Beckett, of Honolulu. TOWBOAT FOR PANAMA. The Isthmian Canal Commission is soliciting proposals for building a stern-wheel towboat for service at Panama. The contractor is expected to furnish the boat knocked down and packed for ocean shipment, steel hull and complete machinery, including steering gear and pilot wheel. The commission will set up the boat, in- stall the machinery, furnish material for and erect the cabins, boiler rooms, engine room and pilot house. The general dimensions are: Length over fantail, 108 ft.; length between per- | pendiculars, 90 ft.; beam, molded, 19 ft; depth molded, 5 ft 3 in ~The propelling engines are to be of the stern wheel type, tandem compound, _ 7 in. and 14 in. by 4 ft.- stroke. The barges Carrington, Holley and Thomas, of the Pittsburg Steamship Co.'s fleet, have gone to Erie to lay up for the winter. \ oy Rae Batata NYAS SOS 7 Ban