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Hemlock, Lighthouse Tender, Twin Screw, Steam Drive HE lighthouse tender Hrmtock, latest to be completed in an ex- tensive program of new vessels for the United States lighthouse service, had her official trials on Puget sound off Seattle, July 5, and as this is writ- ten (July 17), is awaiting acceptance, Her speed during the trials was 12.8 knots, The Hemtock will go into service in the sixteenth lighthouse dis- trict embracing the waters of Alaska. Second of Her Type Notification of the department’s ac- ceptance of its bid was sent to the Berg Shipbuilding Co., Seattle on Jan. 10, 1933, and formal contract was awarded shortly after. She was launched Jan. 20, 1934, and her build- er’s trial was held June 14, 1934. The bid price for constructing the Hrm- Lock was $228,480, and the contract called for completion within 285 days. The cost of the vessel completely equipped is approximately $240,000. The work was carried out under the supervision of Thomas P. Fowler, su- perintendent of construction, United States Lighthouse service. General plans came from the department while W. C. Nickum, Seattle naval architect, made the hull drawings and the ar- rangements for the layout of equip- ment. The HEMLOCK is a twin screw, steam, all steel, vessel, and is the second of her type to be built, the award for construction following closely upon the laying down of the tender ArBurus at Pusey & Jones Corp., Wilmington, Del. Both vessels were built from the same plans, the only differences being the closing in of the stern of the HEMLOCK, providing two additional staterooms on the upper deck, and the addition of special deep sea anchoring gear, a fathometer, and a gyro com- pass. General Hull Characteristics She has a length overall of 174 feet, 6% inches, a length between perpendiculars of 163 feet, 6 inches, a breath molded of 32 feet, and a depth molded of 14 feet, 6 inches. On a mean draft of 10 feet, 7 inches, the load displacement is 770 tons in salt water. The fuel tanks have a capacity of 103 tons, giving the vessel a cruising radius of approximately 2000 miles at 13% miles per hour. The stem is raked and the stern is ae EM LOCK —Light- house tender. Twin screw, re- ciprocating steam engines. Speed 13 miles per hour. Built by the Berg Shipbuilding Co., Seattle. Line drawing does not show closing in’ of the stern © Photo by Kerwin, Seattle yare_|E ns Bilt i Sie ae overhanging. There is a continuous main deck with closed inside gang: ways on both sides from the forward end of the main deckhouse aft and around the stern. Steel watertight shutters three feet square and 18- inch hinged airports are fitted in the Sangways. Other features include a raised forecastle deck, a main deck- house and partial upper deck, an up- per deckhouse aft, pilot house with master’s quarters, a _ steel derrick, mast and boom. Seven Transverse Bulkheads Space below the main deck is divi- ded into eight compartments by transverse oil and watertight bulk- heads. The main hold is arranged to contain galley fuel oil tank, drinking water tank, refrigerating machinery, steam hoisting engine and rig, shelves and locker for stowage of cargo. The lower decks between collision bulkhead forward and main hoist and aft of the engine room are arranged for crew’s quarters. Of- ficers’ quarters are located on the main deck aft of engine room. The power plant of this vessel con- sists of two, three cylinder, triple expansion steam engines built by the Washington Iron Works, Seattle. With twin screws, the speed is about 13% miles per hour. Engines are 11% x 19 x 32 inches diameter and 24-inch stroke. Each engine develops 500 indicated horsepower at 150 revolutions per minute, making a to- tal of 1000 horsepower. Each en- gine drives a four-bladed propeller, 7 feet, 3 inches in diameter and 10 feet, 9 inches in pitch. The star- board propeller is right handed and the port propeller is left handed. Steam is supplied by two Foster- Wheeler boilers, water-tube type, hav- ing a combined heating surface of 2500 square feet. The operating pressure is 200 pounds, but the boil- ers are suitable for a maximum of 225 pounds pressure per square inch. The boilers are oil fired through May- flower oil burners supplied by Bab- cock & Wilcox Co. Deck equipment, including steam steering gear, steam anchor windlass, cargo hoist engine, boat winch, and the reel for deep sea anchoring, was (Continued on Page 40) sii tH 14 MARINE REvIEw—August, 1934