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24 MARINE [November 28, REVIEW. = / " éx6éx237% k------ _ 160 a " aet + 60 x 85 36'x 97.6" | Te = re --_-- a" =, a 60 x 35% Ha 1btZ si oa 7 ES 157 Plate ; o Be o ~ # Ra eC Need ew eee o 7 o 12"x 20.5 : ': 4 E - Frames 12" x 95 spaced 8 ft. <b a 26 1s Plate L " " # i) 1 3"x 8"x 7.2 B46 x 344 x 8.5 2 48"x 20 x ae ee thy ® i f De SSS 15"x 337 Channels } So pa a | rr oe 1b ( oe : : # 16 ye Plate 4x3 x 85" 12 x 20.5 aa tH | 36% | p12" ott op S : 23.51 [-l x 20.5 R i CG eo o Xn ~ # HH 15" Plate ae N 3 : irs0e" hie J Rb 2857 aes " , i 12 x 20.5" 4 2S # 9" x 20"L, spaced 9 ft. x x Py. 15° Plate 4 and4"x3"x 8o™Lspaced 3 ft. Sn eS cf 5"x 3"x9 FT 48 x 20 3 ~ o3 ' 10 Ceiling y z 20° x 9 ft. under hatches me 1 " 5 " r oO 1 48"517.5 17.5% elsewhere 3%'x 3%4'x 8.5 i ES {+= = Sar he FEM oe ae oat @ 1 Le 4x3 x85,/(8 28 272 |) 157 | GO x/20--HH 5 ve pie Le 16'x 407 |!| Channels 11! spaced 3 ft. 1) TOS, J MARINE REVIEW ae ae i ee Toe : oo ey oe E 26 lope eeu 30 N. A.= Neutral Axis of Girder, a C. G.-- Center of Gravity of Whole Structure. No. 4. PROPOSED TYPE OF CONSTRUCTION. WEIGHT PER FT. OF LENGTH 10545 Les. FRAMES AND FLOORS SPACED 3 FEET, SIX SIDE STRINGERS. Comparison. Weight of hull. Section No. 2 compared with No. 1. 97 per cent. = 3 per cent. reduction. Section No. 3 compared with No. 1. 96 per cent. = 4 per cent. reduction. Section No. 3 compared with No. 2. 98 per cent. = 2 per cent. reduction. Section No. 4 compared with No. 1. 96 per cent. = 4 per cent. reduction. Section No. 4 compared with No. 2. 98 per cent. = 2 per cent. reduction. "Moment of Inertia 26,876,280 Modulus of Section 152,273 Strength of framing for transverse stress. 51 per cent. excess. Modulus of section. ' 118 per cent. = 13 per cent. excess. 151 per cent. 112 per cent. = 12 per cent. excess, 130 per cent. = 30 per cent. excess. 100 per cent. = 86 per cent. = 14 per cent. reduction. 118 per cent. = 18 per cent. excess. 140 per cent. = 40 per cent. excess. 104 per cent. = 4 per cent. excess. 92 per cent. = 8 per cent. reduction. SULTEMEYER'S LAUNCHING APPARATUS. Mr. C. F. Sultemeyer of Chicago sends the following description of his launching apparatus for life boats and floats supplemental to that which appeared in the Review of Oct. 31: "Tn applying the apparatus to large vessels, in particular those which are apt to list heavily, it is desirable to so arrange the slide beams that iARNOMMO al: PHORO: .2: they will always have the proper slope at the time of launching the boat, and we will assume that the slide beams should then be at an angle of 30°. In order to accomplish this it is necessary to have the supports of the PHOTO. 3. PHOTO. 4. beams movable, so that they can be raised or lowered as required. The supports are held by two wire ropes attached to a windlass, operated by a worm gear, as shown in photos 1, 2 and 8. The position of the slide beams can therefore be controlled by turning the wheel in the rear of the cradle, photo 1. The boat itself must, of course, be prevented from leaving the cradle before the slide beams are sufficiently lowered, for which purpose there is a curved elevation at the top of beams, as shown in photo 3, which obstructs the rolling down of the boat until the beams are in proper posi- tion, that is at an angle of 80°. As soon as the boat leaves the cradle and passes over the elevation at the upper end of the slide beams the windlass PHOTO: <5: PHOTO. 6. is locked automatically and the beams are held securely for the boat to roll down. Photo 5 shows the boat held back; photo 6 shows a clear track for the same. "It will be seen from the foregoing description that it is not necessary to pay particular attention to the position of the vessel when launching the boats, but that the operation may go on at any time regardless of the posi- tion of the vessel. The boats may also be launched in groups of three or four by placing the pulleys on one common axle and by having one worm gear to turn all." LARGE ORDER FOR SHIP WINCHES. The Lidgerwood Manufacturing Co. of New York has closed with the Eastern Ship Building Co. of New London, Conn., a very large and "valuable contract for ship winches. The winches are to be installed on the two large Pacific liners that are now being constructed at New London for the Great Northern Steamship Co. There are eighty winches all told, with capacities ranging from 3,000 to 14,000 lbs. Every winch is to be élec- trically operated. The motors will be furnished by the General Electric Co., Schenectady, New York, and the power of the motors varies from 25 to 75 H.P. The machines are of special design, and are to be of the very highest type of quick-running durable cargo winch. The Hill Pacific liners will be the first steamships ever built to handle the cargo exclusively by electricity, and the absence of large steam pipes on deck leading to the 'winches will be a feature of special advantage. A very interesting point concerning these vessels is that all the auxiliaries throughout are elec- trically operated. The value of this order forijship winches is about $100,000. Com'dr F. M. Symonds, inspector of the ninth lighthouse district, i now forming an eligible list from which to fill vacancies for aseiatant engineers of vessels in the lighthouse service which may occur in his district for one year. Persons wishing to take the examination can apply for blanks, either in person or by mail, to his office, room 1481 Marquette building, Chicago.