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MARINE REVIEW. Ola Vell Ls CLEVELAND, O., ann CHICAGO, LiL, eke ate, 1893. No. 20. Duluth's Big Ore Docks. With the closing weeks of the present season of navigation, Duluth has figured quite prominently as an ore shipping port. Asa part of the development of the Missabe range, there has been erected at that port an ore shipping dock that has already taken a place among the most important docks on the lakes, and vessels have been accorded dispatch equal to the best records of the older docks. A view of the new structure, which is owned by the Duluth, Missabe & Northern Railway, is presented on this page. The dock is 2,400 feet long, with an approach about 600 feet long. The height is 5214 feet above mean water level, and width 50 feet, four tracks being laid side by side. There are 500 ore pockets, with a capacity of about 150 tons each, the p esent capacity of the dock being about 75,000 tons. It is ex- pected that this will reach 100,000 tons when the work is com- pleted. The channel has been dredged out on either side of the dock and the intention is to have a depth of 20 feet. The chan- inches diametes and 34 inches stroke, and one boiler r2 feet 3 inches diameter by 11% feet long, fitted for forced draft. New patterns will be made throughout and something neat and orig- inal may be looked for. How a Well-Regulated Log Book is Kept. : How many landsmen know how a well-regulated log book is written up? It seems just as complicated as double-entry bookkeeping when one does not know, but atter a little careful attention and study it's as easy to keep a log book as to eat hot gingerbread. 'There isa list of letters arranged and they look like so much Greek to the uneducated. . The letter 4 stands for blue sky, whether there be clear or hazy atmosphere, c indicates cloudy or detached opening clouds, d denotes drizzling rain, a small / fog, a capital F thick fog, g gloomy, dark weather, / hail, / lightning, m misty or hazy, so as to interfere with the view. The letter o represents overcast, or when the whole sky is covered DULUTH, MISSABE & NORTHERN ORE DOCKS AT WEST DULUTH. nel will be extended go feet back of the present shore line, it is contemplated, the lay of the land being such that this can be done advantageously. Engines and Boilers for the Davidson Boats. Capt. Jas. Davidson of West Bay City, Mich., evidently has confidence in lake tonnage as an investment, and although other yards are nearly all idle, he goes right along laying keel after keel. He has now under construction three large steamers, one of them a duplicate of the Cranage, which is at present the larg- est wooden hull afloat. On Friday last he closed a contract with the Frontier Iron Works of Detroit for boilers and machin- ery for all the boats. This is a tolerably heavy deal for these hard times and will doubtless prove a very acceptable winter job, especially when none of the shops are overcrowded with work. 'The larger steamer will be provided with triple expan- sion engines, with cylinders 20, 32 and 54 inches diameter and 42 inches stroke, and two boilers 13 by 13 feet. The other two boats will each have triple expansion engines 16, 25 and 42 with one impenetrable cloud. Passing showers are noted by the letter f, and g indicates the weather to be squally. Continuous rain is indicated by an 7, snow by an s, and thunder byaz An ugly threatening appearance in the weather calls for the letter «, and visibility of distant objects, whether the sky be cloudy or not, is represented by the letter v. Asmall wis wet weather. A full point or dot under any letter denotes an extraordinary degree. As an example as how the letters are used take gf d/t. This reads very hard squalls and showers of drizzle, accompanied by lightning with very heavy thunder. Numerals denote the force. of the wind. A cipher indicates calm, 1 light air, 2 light breeze, 3 gentle breeze, 4 moderate breeze, 5 fresh breeze, 6 strong breeze, 7 moderate gale, 8 fresh gale, 9 strong gale, 10 whole gale, 11 storm and 12 hurric ine.--Goldthwaite's Magazine. The shell plating of the Lucania, is from thre -quarters to one inch in thickness, the plates mostly being 25 feet long by 6 feet wide.. They are arranged on the raised and sunken strake principle, while the butts trom the keel strake up are riv ted on the overlap system.