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+8 , MARINE REVIEW. In General. Out of a total of over $8,000,000,000 of capital invested in manufacturing in the United States, patents form the basis for the investment of about $6,000,000,000. Electrically lighted buoys in Gedney's channel are nuw generally pronounced a success. Large steamers enter the harbor at night and pick their way along the channel by the lighted buoys. . The mean depths of the various oceans of the world is estimated at about 12,700 feet. The average depth of the Pacific Ocean is about 1,100 feet more than that of the Atlantic. The North Atlantic and the Arctic seas become shallow the nearer the pole is approached. Teak, which has passed into proverb as the best mater- ial for ship-building, is superior to all other woods, from the fact that it contains an essential oil which prevents spikes and nails driven into it from rusting. This property is not possessed by any other wood in the world, and furnishes an explanation of the fact that ships built of teak are practically indestructible. some have been knewn to last 150 years, and when broken up their beams were as sound as when first put together. The finishing of the steam yacht Wadena of Cleveland is of teak. The journal on the main shaft of a coast wise steamer be- "coming heated, water was applied for the purpose of cooling it. The ship made the remainder of her trip successfully, but on examination it was found that contraction from the chilling ef- fect of the water had cracked the journal longitudinally and transversely, and thatone of the formercracks extended through the shaft; which was 14 inches in diameter and 22 inches long, to within two inches of one outside edge, and with that condi- tion of the shaft the steamer had run over 100 miles.--The En- gineer, New York. Water tube boilers are rapidly encroaching upon the field so long held by the fire-tube boiler, and every year sees some new type put on the market. It surprises even those who are supposed to know what is going on to see the aggregate horse power of water tube boilers installed within five years last past. One water tube boiler, which was practically unknown F.W. WHEELER, President. E. T. CARRINCTON, Vice-President. five years ago, has, within this period, sold nearly 500 boilers, 2 from 10 horse power up to 1,200 horse powet each. Other companies have not sold so many, but they have sold a great many, and if the demand continues, as it undoubtedly will, the water tube boiler will be practically the only one in*use. Water tube boilers are not confined to any special duty, but are to be found in all kinds of work on land and sea, and the rapidity with which they are coming into service is worth this brief: mention.--The Engineer, New York. Grease Cups. Automatic Grease Cup. Plain Grease Cup. This automatic cup is provided with a leather packed plunger, which can be reversed by a thumb-nut, full or empty, as a vacuum can not form under it. The plain grease cup is adapted for jarring machinery. For prices write the Lunken- heimer Brass Mfg. Co, Cincinnati, O. F. L. GILBERT, Secretary. ® Builders of all kinds of METAL AND WOODEN SHIPS, @ LakE ERIE BorLER Works, Burrato, N. Y. | IN AMERICA For THE MANUFACTURE OF OPERN DB OTLERS. THE Best EQUIPPED PLANT ae sa ig i aaa ae Re Ne i i Ra) pa ala ali as Sie a i i tL We Dh atl i aS a ier