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from Diagram 1. W and its suffix, by inspection of the apparent slip curves Ss, and scales of W, the co-ordinate points on each can be found. W Y = ----__--_., (1 3)- # is indicated by the suffixes to 5, and W.. S,, by difference betwen s, and s. e from Diagram 1, where e is plotted to base Y. E from same ordinate in Diagram. G .0005 -- approximately = a Re E mum efficiency. The values are indicated thus ¢ on diagram. for maxi- EXAMPLE A. G= 5660 20.75 X 6080 C= == 35 60° @== 8125 p=1 ' R=6.283 G 5660 = _~ = 00054 = y p? a 8.125" X 6.283" (1 -- s)' .00064 is the actual value of ¥ p> (1 -- s,,), deduced from the curve of efficiency E.. . This: propeller: has, therefore, been designed to give the maximum efficiency under the given conditions, and it prob- ably does so. 5660 Views == 002 8125" XK: 35° v 35 Ee Say = = == . Rdp O2e0-% BlZo 1 [.685 849 T3815 The ordinate, which gives s,,, = .315, and the abscissa, which gives W = .002, are respectively in the scales 5,05 and W.0s i. e., the points are halfway between .1 and 0, Soe 105 W .002 Voce pe ee 02 (1 -- x)? 85 '= 08 e=.81. E 62 It is now required to find the dimen- sions of new propellers electrically driven to develop the same thrust. The thrust wm BS S660 KX 62 = 3510. It is pro- posed that the propellers should have an efficiency of 70 per cent .°.G = 5010. The wake value as before .05 Ww = y <x 59D = 0007 X 6 = [.000595, "TAE MarRINE. REVIEW 5010 and @ == 106 000595 X 35* a= 14 G it = 00064, Ri = 145 Ce R = 244 THE ROTTERDAM, THIRD LARGEST LINER. The MHolland-America line enter- tained a large company to dinner last week on board the Rotterdam, the latest addition to the great trans-At- lantic ferry, the occasion being the maiden voyage of the vessel and her 51 cabin and 2,500 third class passengers. With her crew of 475 persons the total carrying capacity is over 4,000. There are 265 first cabin state rooms, 48 of which have private bath and _ toilet rooms, 87 have single accommodation, .and there are 12 suites consisting of private bed, sitting and bath rooms. The dining room extends over the en- tire. width of the vessel, is 92 ft. in length, and exceptionally beautiful in decorations. and appointments. The social hall covers an area 56 by 39 ft., is equipped with a Steinway grand piano and a Mason and Hamlin organ, and has among other decorations a Ss. S. ROTTERDAM. first appearance in the harbor of New York. Before dinner the guests had an opportunity of inspecting the Rot- terdam, which, as the accompanying illustrations show, is a remarkably handsome and commodious vessel, and the unanimous opinion was that, so far as elegance of appointments and consideration for the comfort of the passenger are concerned, the Rotter- dam ranks among the finest vessels in the trans-Atlantic service. The Rotterdam was built by Messrs. Harland & Wolff, Ltd., at Belfast, Ire- land, and was launched on March 3. Her general dimensions are: Length, 6/7 {t.: width; 78:ft.,; and depth, 56 ft. She is of 24,170 tons register, 37,190 tons displacement, and has a carry- ing capacity of upward of 20,000 tons. Twelve transverse and one longitudinal bulkheads divide the hull into 18 water- tight compartments, the double bot- tom being divided into 30 water-tight' compartments... Her propelling ma- chinery consists of twin-screw quad- ruple-expangion engines of over 28,000 H. P., driving the vessel at an average speed of 18 knots per hour. There are accommodations on the vessel for 525 first cabin, 515 second large tile picture representing a view of old "Rotterdam," after Klingenburg. The palm court measures 50 by 42 ft., decorated in cream lacquer, period Louis XVI, and is decorated with large tiles from the Delft Art Pottery Works, with alternate triple windows of decorative burnt glass set in gilt bronze. The panels are of special de- sign. The upper and lower smoking rooms are connected by a stairway, and are furnished in Dutch Renaissance style, and are exceedingly comfortable. The library is also a notable feature, and is splendidly equipped. The accommoda- tions for second cabin passengers have been planned on an unusually liberal scale, as have also the third class. The Rotterdam is equipped with submarine signal-receiving apparatus, Marconi long-distance wireless tele- graph system, and an excellent system of. fire alarm, fire protection and extin- guishing apparatus. An electric pas- senger elevator facilitates communica- tion between the different decks. The lifeboats, of which there are 18, are the Welin quadrant davit. i equipped with