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M.S. Jeff Davis Trials (Continued from Page 17) TRIUMPH, all of which are now in service. This work was handled by the Federal Shipbuilding & Dry Dock Co. and the Boston and Norfolk navy yards. The Jerr Davis, a freight ship, was converted at the Maryland yard at a cost of $1,036,345, this in- cluding installation and special altera- tions, main engine, deck machinery, engine room auxiliaries and all in- cidentals. The ship is 411 feet, 9 inches in length over all, and her length be- tween perpendiculars is 395 feet, 6 inches. The Jerr Davis has a dis- placement at normal mean _ loaded draft of 13,141 tons, with a gross ton- nage of 6204.21 tons and net tonnage 3851. The normal mean load draft is 27 feet, %-inch. Her fuel tank ca- pacity is 1016 tons. Capt. P. P. Tay- lor was in command during the trial run, which was under the supervision of Capt. R. D. Gatewood, manager of maintenance and repairs for the ship- ping board. The main engine, built by Worth- ington Pump & Machinery Corp., is of double acting, two-cycle four-cy]- inder air injection type and has work- ing cylinders of 28 inches with stroke of 40 inches. The brake horsepower is 3625 at 115 revolutions per minute, giving a piston speed of 766.6 feet per minute. There are three fuel nozzles for each cylinder, one at the top of the cylinder and two at the bottom. The American Brown Boveri Corp., installed a scavenger blower, with a capacity of 21,000 cubic feet maxi- HEN the tug Socony 23 shown in the accompanying illustration, was launched recent- ly at the Staten Island plant of United Dry Docks Inc., New York, it was the seven hundred and ninetieth hull sent into the water by that plant since its crea- tion in 1895. The tug is one of two being built for the Standard Transportation Co., New York. Both vessels are intended for harbor and sound work, and are 97 feet long, 22 feet wide and 10 feet 9 inches deep. Their were laid in June. keels 98 mum and equipped with 310 horse- power motor. Auxiliary generating and compressor engines are of the Nordberg Mfg. Co. make, single act- ing, two-cycle, air injection type, with diameter of cylinders, 17 inches and a 23-inch stroke. There are three cylinders giving 500 horsepower at 225 revolutions per minute. The pis- ton speed is 862.5 feet per minute. Emergency lighting and compressor set was supplied by the Cummins En- gine Co., and the water pumps by the Nash Engineering Co. Oil pumps were furnished by the Kinney Mfg. Co. and the Viking Pump Co. The boiler, installed by the Foster- Wheeler Corp., is of the waste heat type using exhaust from the main en- gine. Working pressure is 30 pounds gage and there is 1394 square feet of heating surface. It also is equipped with a Holly turbine type oil burner. The propeller is of 4-blade, built- up type, with a diameter of 16 feet, 3 inches and a pitch of 12 feet, 3 inches. Steering gear includes a Sperry telemotor, with Westinghouse control and automatic follow-up. There are ten Hyde Windlass Co., winches, self oiling, of special design, driven by Diehl motors and_ with Westinghouse quick make and break type of controllers. Both winches and windlass are equipped with Cutler- Hammer Co. shoe brakes. W. Dearborn Clark, assistant traf- fic manager of the American-Hawai- ian Steamship Co., has been named chairman of the eastbound committee of the United States Intercoastal Con- ference at San Francisco. He _ suc- ceeds Warren H. Clarke. Launch New Standard Transportation Tug MARINE REVIEW—November, 1929 Examination For N ava ] Architects To Be Held The United States civil service com- mission announces the following open competitive examinations: Associate naval architect, $3200 a year; as- sistant naval architect, $2600 a year. Applications must be on file with the civil service commission at Wash- ington, D. C., not later than Nov. 20, 1929. The examinations are to fill vacancies in the bureau of construc- tion and repair, navy department, and in positions requiring similar qualifications. The entrance salary is $3200 a year for the associate grade, and $2600 a year for the assistant grade. Higher-salaried positions are filled through promotion. Real Nature of the Work The duties are to prepare contract and type plans for new designs and proposed alterations of vessels; to make studies, conduct theoretical in- vestigations in connection with ship design, make calculations; to check and criticize plans, calculations, and estimates; to prepare technical corre- spondence. Associates are under nominal supervision; assistants are un- der general supervision. Competitors will not be required to report for ex- amination at any place, but will be rated on their education, training, and experience. Full information may be obtained from the United States civil service commission, Washington, D. C., or the Secretary of the United States civil service board of examiners at the post office or customhouse in any city.