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1903.] ELECTRIC HOISTS FOR DOCK WORK. For handling bales, barrels and pieces weighing from a few hundred pounds to two or three tons from ship to dock the elec- tric hoist is admirably adapted. Electric motors are fast dis- placing steam engines and shafting on account of their economy in operation, and nowhere is this more apparent than in inter- mittent hoisting work. With an electric hoist there is no loss due to condensation' in long steam pipes and there are no pipe lines with joints to keep tight as with steam engines. With shafting the loss in transmission of power due to the friction at the bearings is very high. At one steamship dock in New York city it was estimated that it took three tons of coal per day to run the shafting alone. "This loss is practically eliminated with electric power. An electric hoist may be stationary on a wharf where a great deal of work is to be done, or its base carried on wheels or it can rest on a small wagon. If the hoist- ing is to be done along the face of a dock the hoist may be mounted on a narrow-guage railway car, the track for which ex- tends the length of the dock. For supplying power to portable hoists the electric mains are run to boxes stationed at intervals. With a cable having a plug terminal which is inserted in the box the hoist can be moved anywhere within the radius of the cable; beyond this the plug is inserted in another box. A 500- volt street railway tvpe of motor is employed for driving. Either direct or alternating-current motors of any commercial voltage may be used. 'The three essential parts of the hoists are the rope drum, the gearing and the electric motor. These are made in a series of sizes, and bv a suitable com- bination of each, a hoist of any desired capacity and speed with the limits of modern practice mav be built. There are four factors that materially affect the size and cost of the hoist, name- ly, the load, the speed, the height to which the load is hoisted and the frequency of the trips. These factors affect the size, operation and cost in the following manner: If the load is increased the size, weight and strength of the mechanism will be increased; that is, a larger size must be used. If the velocity of hoisting is increased the size and power of the motor will be increased, the other parts remaining the same. If the height to which the load is hoisted is increased the drum must be in- creased to hold a longer rope, the motor remaining the saine. If the frequency of the trips is increased the size of the motor will be increased, the other parts remaining the same. There are three methods of operating electric hoists: First, running the motor continuously, hoisting the load by throwing MARINE REVIEW AND MARINE RECORD. 33 starting and stopping the motor for each lift, lowering by a hand brake. 'lnis is better suited for direct-current than alternating motors. Third, running the motor forward to hoist and back- ward to lower. A direct-current motor, with reversing drum and switches, is used for this work. 'The mechanism of the hoist is so arranged that any size or make of electric motor may be used. The motor is connected to the hoist by a flexible insulated coupling. The great flexibility of electric transmission allows hoists to be installed to advantage in many situations where it is diffi- cult or expedient to use steam-driven machinery. One of the great advantages is that the expense for power begins when the hoist is started and entirely ceases when the motor is stopped. The electric hoists made by the C. W. Hunt Co., West New Brighton, S. I., are especially adapted for dock work and possess all the advantages outlined. A telegram from John R. Bennett of New York, general patent counsel for the Chicago Pneumatic Tool Co., reports to that company an important opinion from the United States circuit court. The opinion is given in the case of the Chicago Pneumatic Tool Co. against the Franklin Boiler Works Co. for using the tools of the Philadelphia Pneumatic Tool Co. of Phil- adelphia. "After overruling all of the defenses interposed," says Mr. Bennett, "the opinion fully sustains the second claim of the Chicago company's Moffett patent, finds the Philadelphia com- pany's tools to be an infringement and continues the injunction against them. Under this opinion the injunction against the Phil- adelphia Pneumatic Tool Co. will be restored and continued in full force and effect. A point of special. importance to the users of pneumatic tools is that this opinion of the circuit court of appeals establishes the Chicago company's right to an. in- junction against all users of the Philadelphia compsny's infring- ing tools. The litigation in which this opinion is given has heen most vigorously contested by the Philadelphia company, who as- sumed the defense of its customer. the Frerklin Boiler Works Co." The Worcester Polytechnic Alumni Association of New York, held a well attended and enthusiastic meeting et the Hotel Albert, Eleventh street and University place, New York city, on Tuesday evening, Mar. 17. The association includes seventv-five ereduates of the institute, the majority of whom hold prominent positions in. various engineering and manufacturing concerns in New York city. The next meeting will be held at the same place in a friction clutch and lowering by a hand brake. is suitable either for alternating or diregt-current motors. This method Second, be present. on April 28 and all Worcester graduates are cordially invited to PITTSBURGH WHITE METAL GO. MANUFACTURERS OF THE BEST BABBITT and ANTI-FRICTION Metals Known for any Purpose. Made from the Best Materials, Price and Quality Guaranteed and Always Consistent with the Market. PITTSBURGH, - PA. SIMPLEST AND BEST , eye APPLIANCES OMPANY =, ole LDPC ED WITH THE Q-C COMPAR RS NEW YORK OFFICES 14 LIBERTY ST. GENERAL OFFICES OLD COLONY BUILDING CHICAGO, $10 Reward. William Kerr Reid Wanted. The above reward will be paid to any person giving the present location of William Kerr Reid withia thirty days from the publication of this notice. : Came to America from Glasgow, Scotland, in 1894; workedin Erie, Pa., in 1895; bo rded at 115 and 150 East 2d Street; was in Cleveland. O, in 1896; left there for New York City in 1896 or 1897 in search of work, stating he would go sailing on salt water again if un- able to find work; was an A B. sailor, and sailed on boats. on the G eat Lakes durine the above years. Address, THOMPSON & THOMSON, Birmingham, Alabama. - Steam Yacht for Sale. Steam yacht, 30 ft. over all, 7-ft. beam. Fitted for salt water use. Burns kerosene. Is in fine order. Will be sold cheap. J. L. Alberger, 695 Ellicott Square, Buffalo, Nay; : Apr. 30. Salesman Wanted. An article for every boat Not new. Saves money while improving service Large profits. Address Box 40, Marine Review Pub. Co., 39-41 Wade Bldg., Cleveland 0. tf - Position Wanted. Stecl Ship and Yacht Bui'ding. First class mechanic will be open for en- gagement after April 6, to take charge of the construction of steel boat work. First class references. Address ship builder, Care Marine Review Pub. Co., 39-41 Wade Bldg., Cleveland. i April 9. Steamer and Tow Barge for Sale. For Sale--Canadian steatner Orion, class A-2. Capacity 30,000 bushels of wheat or: sco M ft. of lumber or 900 tons coal. - Canadien tow barge Muskoka, A-2. Ca- pacity 30,000 bushels wheat, or 600 M ft. of lumber, or 900 tons coal. For particulars apply to- Collins Bay Rafting & Forwarding Co., Ltd., Kingston, Ont. June 18. Towing Outfit for Sale. For Sale--Complete towing outfit includ- ing tug, scow, sand pump, etc. All in good order; reasonable price. Address Butler Bros., St Paul Minn. Apr. 2. ' Steamer for Sale. The steam barge Arcadia; length 1188 ft., breadth 26.2 ft. Tonnage 230 gross, 146 net. Address: The Henry Starke Lend & Lb'r. Co., Arcadia, Manistee Co., Mich. 14 U. S. Engineer Office. Grand Rapids. Mich., Mar. 12, 1908. Sealed proposa's for extension of west breakwater at Petoskey, Mich., will be received here until 8p m., April 11 1908, and then publicly ope. Information furnished on application. CHARLES KELLER, Capt. Engrs. Apr. 9. U.S. Engineer Offiee, Duluth, Minn., Mar. 12, 1903. Sealed proposals for furnishiig 6,000 barrels Portland cement for concrete superstructure to breakwater at Marquette, Mich.. will be received here until noon Apr, 11. 1908, and then publicly opened. Information on application. D. D. GAILLARD, Cap ee pr. 9. U.S. Engineer Office, Duluth, Minn., Mar. 25, 1903. Sealed proposals for furnishing 7,000 cu. yds. broken stone and 4,000 cu. yds. sand for Concrete Superstruc- ture to breakwater, Marquette, Mich., will be re- ceived here until noon April 24, 1903, and then public- ly opened. Information on application. D. D. GAILLARD, Capt., Engrs. April 16.