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162 March, 1901, and 0.53 foot above the low stage of March, 1892. It will probably remain about stationary in April. Lakes Michigan-Huron are 0.04 foot higher than last month, 0.06 foot low- er thana year ago,0.15 foot below the average stage of March of the last ten years, 2.95 feet below the high stage of March, above the low stage of March, 1896. They will probably rise about 0.4 foot in April. Lake Erie is 0.49 foot higher than last month, 0.10 foot lower than a year ago, 0.11. foot abové the average stage of March of the last ten years,. 2.17 feet below the high stage of March, 1887, and 0.85 foot above the low stage of. March, 1896. It will probably rise about 0.8 foot in April. Lake Ontario is 0.72 foot higher than last month, 0.05 foot higher than a year ago, 0.32 foot higher than the average stage of March of the last ten years, 2.06 feet-.below the high stage of March, 1886, and 1.45 feet above the low stage of March, 1897. It will probably rise about 0.9 foot in April. : THE LIFTING MAGNET IN WRECKING AND SAL- VAGE OPERA- TIONS. Another useful application of the lifting magnet has been found in re- covering submerged material. It is now being used to raise steel cargoes _from vessels sunk in the Mississippi river. The present experiment is be- ing made near New Orleans, where a barge load of kegged nails is being raised. A load of cotton ties, sunk near Natchez, will be next taken up, while a load of woven wire, sunk near Pittsburg, will be the third task. All are the property of the United States Steel Corporation. The magnet used in the work is 3% feet in diameter, and weighs 3,000 pounds. It is drop- ped into the stream, the current turn- ed on, and five or six kegs of nails raised to the lift. A derrick is em- ployed for the purpose. The nails weigh 200 pounds to the keg, so the magnet lifts from 1,000 to 1,200 pounds each operation. A great say- ing is being realized by the use of the magnet, which could not be otherwise effected. Were a dredge used, kegs would 'be broken open, and much val- uable material lost. In this way, the kegs are raised intact, and the nails are uninjured, except for slight rust. Between 85. and' 95 per cent of the cargo can tbe raised, It is valued at $45 per ton. The kegs are raised 1886, and 0.89 foot . THE MARINE REVIEW from a depth of 70 feet.. Much thought has been given to the problem of thoroughly waterproofing the lifting magnet as pointed out in the very complete article on "The Lifting Mag- net as an Industrial Factor" in The Iron Trade Review, Jan. 6, 1910, and the foregoing examples are evidence of the thoroughness with which this is accomplished in existing types. Instances are frequent where mag- netic material, either loose or boxed or crated, is submerged so as to be easily reached by a magnet though possibly at depths too great for a diver, even if the value of the salved material were high enough to justify his employment. In many other in- stances the combination of the two might make profitable operations Park Cast April, 1910 Iron Pipe Foundry. |} will be built of timber, and it js thought can be ready to handle the ore some time during the latter half of the season. Whitney Bros., con- tractors of Superior, have the work in hand, and have begun by driving piles in order to determine the nature of the bottom. The dock will be a smal] affair at first, because it is expected that not more than one mine will be in the shipping list this year. If it should be desired to ship before the dock at Superior is completed, the Soo line, it is expected, will use its dock at Ashland for the Cayuna ore. ROACH'S SHIP YARD SOLD. The plant of the Delaware River Iron Ship Building & Engine Works, THe Lirtinc MaGnet Satvinc Kecs or NaAIts. which would otherwise not be under- taken, especially as the modern wreck- ing steamer requires the addition of nothing whatever in the way of equip- ment except the magnet"itself to make its use possible, The magnet used in the operations referred to above was made by the Cut- ler-Hammer Mfg. Co., Milwaukee. WORK BEGUN ON NEW ORE DOCK. It is announced from Superior that the Soo line has begun preliminary work looking to the construction of an.ore dock at that port for the pur- pose of handling the output of the Cayuna range, which, it is expected, will begin shipping some time next summer. The dock is to be located on St. Louis bay, near the Billings Chester, Pa. which' was known. "fos years as Roach's ship yards, was sold at receiver's sale recently. The pur- chaser was William H. Hanford, act- ing for William Holman, of New York, The price' paid 'was > $153,210) subject to a mortgage of $100,000. SAND SUCKER FOR CHICAGO. The Manitowoc Dry Dock Co., Man- itowoc, Wis., is building a sand suck- er for the Lake Sand Co., of Chicago, (164 ft. long over all; 156 ft. keel, 35 ft. beam and 10 ft. deep. She will carry 600 ft. of sand in a hopper on deck. The hopper is divided into six compartments, each of which has an emergency freeing port for discharg- ing the sand in case of accident. The hull is divided into seven water-tight © compartments with independent water bottom Piping to each: The pilot \