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August, 1919 ways had a slope of 134 inches to the foot and were supported permanently on concrete piers, except , forthe Ourer ends which were on piling. The height of the boat above the water when leaving the ways was 3%4 feet. The speed of the boat at launch- ing was 16 feet per second. The time of launching from cutting the lines until taking water was 11 seconds. The maximum list of the boat was 9 degrees. This was determined by a glass U-tube, with vertical' legs spaced 3 feet, half filled with thin paint, located' in a fixed position on the upper deck. A pendulum 'indicator consisting of a 10-pound mass mounted on a stiff-bar radius arm 24-inches long was also used. This was entirely unsatisfactory. Its THE MARINE _ REVIEW tically no hog or sag. The readings taken at quarter points showed defection of one sixteenth of an inch. Dimensions of the boat and sizes of main equipment are: Overall length 162 feet, hull length 137 feet 5 inches, beam 27 feet, depth 6% feet. The engines are of the tandem com- pound type placed fore and aft on the after deck, cranked directly at 90 de- grees to the stern-wheel shaft. The cyl- inders are 14 x 30 inches bore with 6-foot stroke. The stern wheel is 20 feet in diameter and 18% feet long. Steam at 200 pounds pressure -to the square inch is generated in three boilers 40 inches diameter x 28 feet long, lo- cated fore and aft on the forward deck. The boat was built for the Vesta Coal 395 unit which is mounted in any con- venient place on the bridge or in the wheelhouse. The taffrail instrument is provided with a flywheel, 5, which: is firmly fastened to the shaft, 6. At the outer end of the shaft is the usual shackle to which is bent the log lin carrying at its further end the whirling drag, as in ordinary practice. The housing in which the shaft jour- nal is located is shown at 7, while 8 is the case that confines the working mechanism consisting of a gear train actuated by. the driving shaft, 6, which revolves the pointers, 9 and so. By this means, the whirling drag registers knots through the medium of the large pointer, zo, while the small pointer, 9, registers divisions of one knot in tenths, b 16 he 7 i REPEATING SHIP'S LOG TO ENABLE THE NAVIGATOR TO NOTE THE VESSEL'S RUN AT ANY TIME FROM THE BRIDGE results would probably have been better had the radius arm been much shorter. On recovery the boat listed 5 degrees in the other direction. The boat dipped 18 inches lower on the stern when taking the water than was the draft afterward at this point. This was noted by two observers located on shore with levels, readings being taken on the stern flagstaff which was gradu- ated. The boat left the ways squarely. Two obseryers, sighting past range poles !o- cated at the water's edge, only estimated a 6-inch variation for the length of the boat. The weight: of the boat when launched was 367 tons, figuring its -dis- Placement. The draft at the stern was 4 feet 334 inches, and at the bow, 2 fect: 834 inches. The stern launching sled car- tied a weight of 111 tons, having a pres-: Sure of 4.1 tons per square foot on the ways.: After flotation, the boat showed prac- Co; and will be used by that company in towing. coal for the Jones & Laughlin Steel Co. She is now in commission. - Repeating Ships' Log Many years ago, when the taff- rail log was first introduced to replace, the cumbersome hand- heaved ship's log, it met with instant favor due to the fact that it served as. an accurate and readily consulted means for noting the ship's speed at any time. To enable the navigating officer instantly to note the vessel's speed without leav- ing the bridge, Charles P. Maxson, West Mystic, Conn. recently devised and patented a repeating form of log which embodies an electric principle. Mr. Maxson's log is shown in the accom- panying illustrations. The unit at the right is the taffrail member as viewed from thé port. side while at the left is shown the repeating The shaft rz, on which the pointer, 05' is installed, also carries a disk, 12, which is provided with pin, 13. These are equally spaced to correspond to the divisions over which the pointer, 9, travels. As the disk, 12, revolves, the pins, 13, deflect the electric 'spring switch, 14, which causes it to make connection with the terminal block, 15. The switch terminal and block are part. of an electrical circuit' of which 16 and 77 are the lead wires, 18 the battery, or other electrical source, while in the recording instrument, 79 is an electro- magnet. This magnet is energized every time the switch, 14, makes connection with the terminal block, 125. This 'action coincides' with the movement of the pointer, 9, and is for the purpose of moving the pointer, 20, on the repeat- ing instrument. In general principle, the' repeating instrument resembles the taff- rail. unit as the pointer, 20, shaft, 21,'