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lower pendu'um records the pitching; its axis is at right angles to the lon- gitudinal axis of the ship. Figs. 2.to.5 are reproductions: 61 records obtained different ships. The various: ships -differ "quite as strongly as to their pitching and roll- ing as could be expected. The Sono- ma, 6,000 register tons, of the Oceanic Steamship Company, was on her way from Australia to New Zealand when the records of Fig. 2°were obtained. The Manchuria (Fig. 3), 13,700 regis- ter tons, of the Pacific Mail, was steaming from the Sandwich Islands to Japan. The Prinzess Alice (Fig. 4), 11,000 register tons, of the Nord- deutsche Lloyd, was steaming in the Chinese Sea; and the Tanglin (Fig. 5), 1,200 .register tons, also" of? the Norddeutsche Lloyd, was cruising in the Gulf of Siam. It has already been mentioned that a change in the or- dinate of 1 millimetre on the diagram corresponds to an inclination of the ship: through 'half (a. degree of arc; the time scale is marked on the dia- grams. The two large steamers, the Manchuria and the ° Prinzess Alice. show, in addition to the short-period - motions, rolling oscillations of more than two minutes. -The diagrams are, of course, not directly comparable, as winds and seas differed. But the sim- ple apparatus gives definite informa- tion about the smaller oscillations, which had so far hardly been studied quantitatively, and it will be interest- ing to compare these cu*ves with other stability curves taken on beard ship. on THE SCHLOTTMANN NAIL LOCK, One of the many interesting exhibits at the New York Motor Boat Show was a nail lock invented by Fred. C. A. Schlottmann, Evergreen Ave., Brooklyn, and used in the construction of wooden boats. This lock is an improvement on the present method of riveting or clinch- ing the nail, as it not only makes a se- cure and durable fastening but improves the appearance of the boat to no little extent. The accompanying illustration is a sectional view of the planking of a hull, the nail locks shown in position. To apply the nail lock the usual hole is bored, an additional hole to receive the nail lock being bored on the inside of the boat. The nail Jock is then driven into the place and held in posi- tion by a heavy nail while the nail is being driven home. It will be noticed that the hole in the lock is so designed that the nail turns itself and enters the wood in a hooked position. There are four designs of nail locks to suit the "stuffing-boxes TARE Marin'. KEVIEW THE SCHLOTTMANN & BACHENBERG NAIL LOCK. different. requirements of the _ boat- builder, the sizes ranging from the or- dinary 8-penny 'nail to % inch. They are of brass or malleable 1ron galvan- ized. NEW DEVICE FOR SHIP REPAIRS. A new inveniicn, the Williamson submarine tube-caisscn, is intended to supersede drydocks and enable the crew to clean in a fairly thorough manner the foul bottom of a sh'p in ceas where drydecks are not available. It is expected to permit replacing a lost propeller whle at sea, or repar- ing moderate injuries below the water line. The caisson, wh'ch is in operation at Norfolk, has 'been snspected by several officers of the navy, and their reports are said to be so favorable that the Williamson company is pre- paring a set of blue-prints for cais- sons of various sizes equipped in a variety of ways with glass bull's-eyes, thrcugh which tools can be manipulated, flexible rubber arms, electric _Ights and other appli- ances to aid in under-water work. The caisson is a flexible steel-ribbed tube which, whn extended, makes. a well in the wat-r. At the bottom is a work-chamber fitte1 with bull's-eyes and rubber arms. To overcome the greatly increas'n* pressure of water at increasing depth, Capt. C. William- son, the invenitcr, designed a collap- sible tube of iron plates working on hinges outward, after the manner of an accordion. A section fully ex- tended is ten feet in height. Put s 47 over the side of the vessel it dis- placés "just. as? 'Arwen water ae weighs and remains extended. To the top is clamped another section, the joint being water-tight. As the lower section is slowly forced into deeper and denser water by the weight of the added section it slowly and slight- ly collapses. uni! its disp'acement again equals its weight. The addition of other sections has a corresponding effect until the bottom section, at a great depth, is col'apsed into a space of less than six feet and is capable of resisting great pressure. It is be- lieved that work can be carried on at a depth of 150 feet. The caisson is enclosed in a canvas rubber-coated jacket impervious to water. © For the navy it is proposed to fit the caissons wth solid inserts be- tween each section, each insert to be equipped with buli's-eyes and rubber -- arms. By lowering the caisson Over. the side of a vessel and drawing it close to the hull it will be possible for two or three men to work simul- taneously in cleaning the hull or making repairs, the rubber arms en- abling them to manipulate tools dropped on the outside from above and operated by compressed air. Work has already been done in Nor- folk harbor "on "the wreck of tie Rogers in 25 fe:t of water and the caisson will probably be engaged in repairing the sea-wall at the Norfolk navy yard. Should the government undertake to raise the Maine a propo- sition: will be submitted for furnish- ing specially designed Williamson caissons for this work.--Army and Navy Journal. THE WORLD'S FASTEST SHIP. In the course of the trials now in progress, the new torpedo-boat destroyer, "Swift," built as an experimental vessel for the British admiralty by Messrs. - Cammell-Laird Co, Birkenhead, has attained the remarkable speed of 38 knots per hour. This is the greatest speed at which a vessel has ever traveled. The "Swift" has twelve boilers, eight turbines, and four propellers, and burns from 12 to 14 tons of petroleum each - hour. The Admiralty will not permit her to be "let out,' otherwise her speed could be considerably increased. New Japanese legislation is expect- ed whereby the subsidies of the Nip- pon Yusen Kaisha will be reduced by $270,000 and those of the Toyo Kisen Kaisha by $75,000. The total amount of the subsidies grarited by the new bill is $3,762,125.