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coe units, pyrometer protection tubes and other equipment at points of high temperature. Though not generally known, calorizing has been utilized successfully, under certain conditions, as a means of preventing corrosion. Information is desired from engi- neers engaged in stationary power plant and marine work respecting serv- ice they are getting from condenser tubes. Co-operation of such engineers is requested and will be greatly appre- ciated. To be of value, reports should contain specific data on the following points: (A)Metal of which tubes are RAMMING THE MOLD made, (B) size and length of tubes, (C) life of tubes. Communications on this subject should be addressed to Robert June, of the Diamond Power Specialty Co. : Endorse Diesel Rules At a meeting of the representatives of the American bureau of shipping and the manufacturers advisory committee held at the offices of the bureau Nov. 11, revised rules for the classification of internal combustion engines, as drafted by the engineers of the bureau, were subimiited to, and approved by the comuittec. The foliowing members of the com- snittee were present: Harte Cooke, McIntosk-Seymour Corp.; Max Rottez, Busch-Sulzer company; B. Nordberg, Nordberg Mfg. Co.; W. T. Dimm, Newport News Shipbuilding company. Important business engagements pre- vented, the attendance of Dr. Charies FE. Lucke, chairman of the committee. To give builders of diesel engines op- portunity to voice suggestions in con- nection with various requirements of the rules, an invitation was issued to attend a meeting at the bureau on Nov. 12. The meeting was largely attended and 'the rules were approved with THE MARINE REVIEW minor modifications. The rules have now been submitted for the final ap- proval of the bureau's committee on engineering. It is expected the new rules wiil be issued by Jan. 1, 1921. Welds Rudder Frame When the 4341-ton Green Star line freighter Wrst GRAMA_ was recently placed in drydock for repairs at the Robins Dry Dock & Repair Co., South Brooklyn, N. Y., the frame of her 9-ton cast steel rudder was found fractured in four places. To replace the rudder by purchasing a new cast- ing would have cost about $9000, not including the cost of installing the renewal and loss due to'idleness of the vessel, awaiting delivery of a new rud- der, which would have taken about four months. It was, therefore, decid- ed to repair the rudder frame by ther- mit welding. In making this repair, the rudder was unshipped and laid on the dock with the frame in a horizontal plant, as shown in the accompanying illus- trations. The metal surrounding the four breaks was then cut out with an oxyacetylene torch and chipped with a pneumatic chisel, so that four gaps each about' 3 inches in width, were made to provide space for the thermit steel toenter. As the fractures in this par- ticular repair extended only partly across the casting it was necessary during preheating to offset contraction strains by heating the ribs at the ends of which the welds were located. Each pair of welds was poured simultaneously, as the pattern wax previously had been shaped to connect the two gaps in each pair of welds. For the whole job 450 pounds of ther- mit was used in each of the two cru- cibles. The welds were satisfactorily completed within five working days after the fractures had been cut out. Stopping Engine Knock The engineer of a newly built oil tanker recently was confronted with the problem of eliminating a knock in a stationary gasoline engine installed aboard his ship to drive the pump used for pumping oil out of the tanks. The engine refused to perform effici- ently due to the knocking. Examina- tion showed that the knock mwas not a bearing knock. All kinds of vapori- zer adjustments were tried but to no avail. , Then the compression of the engine was tested, in the thought that the engine originally had been intended for operation by gas instead of gaso- line. It was found that the compres- sion was too high and this was re- the 'vaporizer January, 192] duced by planing off the connecting rod brasses, in order to permit the piston to go down. farther to relieve compression. This quieted the knocking to some extent but did not eliminate it entirely. An experiment then was made in substituting a carburetor in place of. the vaporizer with which the engine originally had been 'equipped. The was provided with a hit and miss governor. After the instal- lation of the carburetor, the knocking was eliminated and the engine gave carburetor entire satisfaction. The MAKING THE WELD employed was of the automatic, float feed type; the engineer desired a car- buretor of the overflow type but was unable to secure it without going through the delay of having it made to order. He simply removed the float from the carburetor bowl and piped an overflow pipe into the bowl at the correct 'height in order to keep the gasoline at the right level in the bowl. Form Maritime Body The Maritime Association of the Boston chamber of commerce recent- ly has been formed to further the in- terests of, the port cf Boston. . The™ board of directors consists of: Edward E. Blodgett, attorney; G. J. Jackson of the International Mercantile Marine: Capt. Eugene E. O'Donnell of C. H. Sprague & Co.; George Wooley of the Commercial 'Towboat Co.; Charles Stewart of the Cunard line; Charles EF. Spercer Jr., vice president of the First National bank; William E. Hodge of the Boston Insurance Co. and others. The steamer Witren struck a dock at Duluth recently and damaged her stem and fan bow plates,