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tHE MARINE REVIEW Ca : MONSTER BOILER FOR NAVAL PLANT Ludlum type boiler weighing 85,000 pounds made by the New York Engineering Co., Yonkers, N. Y., for experiment station of the navy in 1492 and the dip of the needle by Robert Normand in 1576. The com- pass box and hanging compass is said to have been invented by William Bar- low in 1608 while the graduated com- pass card is credited to Joseph Bing in 1602. Carries High Steam Water tube boilers for marine serv- ice have attracted interest ever since their active development and _installa- - tion on vessels of the emergency fleet. The accompanying illustration shows a Ludlum-type water tube boiler, a type which is of particular interest owing to the large size and high pressure. That illustrated is 15 feet high, 1714 feet wide and 12 feet deep, with a furnace of approximately 500 cubic feet volume. Its weight is 85,000 pounds complete. It was built for a working steam pressure of 350 pounds, and tested to 550 pounds hydraulic pressure. The steam drum is 48 inches by 12 feet, witha tube sheet 11% inches thick. The water drums are 30 inches by 12 feet with tube sheets 14% inches thick. All drums have double butt strap and double rivet- ed joints. The tubes are cold drawn seamless steel, 154 inches outside diameter. The casing is steel plate backed with as- bestos mill board and 2 inches of high tempered special insulating material. The combustion chamber has a 9-inch fire brick lining backed up with the same type of insulating material. The bot- tom of the furnace is shaped on an arc of a circle to allow for the proper expansion of the brick lining. The unit is equipped with cleaning openings for each bank of tubes and December, 1920 also with automatic soot blowers, the latter being operated by a chain pull. Thev are designed automatically to dis- pose of water of condensation in the piping and also to shut off the steam automatically after cleaning is com- pleted. This boiler was too large to be shipped by rail and it was transported on a barge, completely assembled, as_ il- lustrated. On arrival at the Annapolis naval station it was necessary only to set it on its foundation and connect up piping and smoke stack. No mason work or boiler setting was required. The equipment was built in the shops of the New York Engineering Co., at Yonkers-on-the-Hudson, N. Y. This com- pany is now at work on a battery of boilers of the same type for the United States navy, each unit of which will be much larger than the one _ decribed. When completed they will be installed in one of the new. battleships now uwun- der construction. Bends Heavy Plates A large plate bending brake, built by the Dreis & Krump Mfg. Co., Chicago, for the Newport News Shipbuilding & Dry Dock Co., Newport News, Va,. and claimed to be the largest machine of its kind in the world, has the feature of rapid operation. The time consumed in making a right angle bend is less than one minute. Another feature is that no dies are required for different thick- nesses of metal, radius of bends or degree of angle to which plates are bent. As shown in the accom- panying illustration, this machine, which weighs 30 tons, nasa capacity: for bending plates 12 feet RIGHT ANGLE BENDS ARE MADE WITH THIS MACHINE IN LESS THAN A' MINUTE