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180 when operated at rated speed and rated load. It has been demonstrated that the engines are capable of a reduction in speed of 60 per cent. The. standard sizes built are 300, 500, 750, and 1350 brake horsepower. Hoisting Machinery The Delorie Hoist Co., New York City, has just issued an attractive pamphlet describing the type of hoist which the company has developed for use on lighters and docks. Construc- tion details are fully explained. The catalog includes a 2-page graphic de- scription of the various component parts of the hoist which are combined as a single unit on an I-piece bed- plate. The hoists are operated by THE MARINE REVIEW Treenail Machine The government's wooden shipbuild- ing program calls for the driving ot a huge number of treenails and with the object of furnishing an automatic ' machine to turn treenails quickly, the Ober Mfg. Co., Chagrin Falls, O., has developed the machine shown in the accompanying illustration. ; The machine is entirely automatic, the operator merely keeping a pile of square stock between the guides at the front of the machine. scuares are fed automatically so that when one stick leaves the feed rolls the next stick drops into place and in turn is fed through the machine. . The turning is done by a series of knives. The first knife simply rounds AUTOMATIC MACHINE FOR TURNING TREENAILS internal combustion engines which, it is claimed, operate successfully on the cheaper grades of fuel such as low-grade distillate kerosene as well as gasoline, benzine, naphtha and motor spirits. It is pointed out that these engines are easy to start in the following manner: The 'engine _ is set on the outward dead center and primed with gasoline and then pulled up against compression. The magneto is next tripped which starts the en- gine without cranking. Two types of hoists are carried in stock, single and double drum. These are made in 3, 6, 10 and 15-horsepower sizes, with drums 6 x 12, 10 x 15, 10 x 15 and 14 x 16 inches, respectively. According to a report from Copen- hagen, the Danish merchant fleet has 16 vessels more than 100 years old. The oldest is the CoNnsTANcr, registered at Nalskovy, and built at Aeroe in 1723. This vessel has been in commission during the reigns of more than 10 Danish kings. She was 100 years old when the first steamboat was built. the work. The finishing knives, which are automatically moved to and from the center of ithe die by a cam pat- tern, make any shape of treenail de- sired. | ihe cam pattern, 'which . is plainly shown in the illustration, is made of wood so that any style can be put on the lathe in a short time. By means of a simple adjustment the tapered end of the treenail can be changed without altering the cam pattern. The machine, it is pointed out, will turn from 600 to 800 treenails per hour and it can also be utilized for turning other round parts, should occasion require. The regular lathe will turn work up to 1-11/16 inches in diameter and is furnished with four dies and with gearing to turn from 2 to 18 feet long. Julius S. Holl, formerly -advertising manager for the Link-Belt Co., Chi- cago, is now associated with the Uni- ted States shipping board in the Capacity of assistant head, depart- ment of shipyard volunteers. Mr. extensive recruiting campaign for the The © 'nae link 'out that practically April, 1918 Holl's department is carrying op é purpose of obtaining 250,000 volun. teer skilled workers for our shipyards His office is at 207 National Theater building, Washington. Riveters for Shipyards A new catalog describing the full line of riveters handled by the Vulcan Engineering Sales Co., 1765 Elston avenue, Chicago, for the Hanna Engi- neering Works, has been issued. Con- siderable space in the catalog is de. voted to descriptions of special ma- chines adapted to shipbuilding. Many designs of riveters suitable for use in automobile plants, boiler, tank and o- comotive shops also are presented. A comprehensive description of the Han- motion is given This motion is employed exclusively on Pianna type riveters. It 18 so aa justed that a predetermined and prac- tically uniform pressure is developed on the die during approximately the last half of the piston stroke, or what amounts to about the last half inch ot dic travel. Therefore, it 1s sau only a single stroke of the die screw is necessary to take care of ordinary variations in the length of rivets, thickness of plates, size of holes, etc. The aim of the designer of the Han- na riveter was to develop a machine which would give results comparable with hydraulic riveting when using compressed air. Leakproof Boats "How to Make Your Boat Leakproof"' is the title of a booklet recently issued by L. W. Ferdinand & Co., Boston. The booklet is interestingly written and gives full instructions for making small boats waterproof. The process consists of applying marine glue in a_ heated state, over which is placed a layer of canvas which in turn is heated. This causes the glue to fill the pores of the cloth,- making, so it is claimed, an ab- solutely watertight bottom. It is pointed worthless _ boats, whose seams have been strained and opened, can be made as waterproof as when new. The booklet describes the material used and gives explicit im structions for its use. Force feed lubricators are described in a 12-page booklet recently issued by the Inter-State Machine Products Co. Rochester, N. Y. The benefits of am efficient lubricator are set forth. The booklet contains a complete description of the pumping unit, check valve, clutch and driving mechanism. The booklet is well illustrated and explicit instruc tions for making installations are given.