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‘without leaving his operating stand. The low pressure air system re- ceives its air through a reducing valve from the active air bank. Low pressure air is used to blow out the sea chests, for the air tools in engine room, and for the air motors, for turning the main engines when not in operation, also for the ‘‘Typhon”’ sound signal. Besides the 15 kilowatt diesel gen- erating set, there is installed a 55 ceil iron clad Exide battery to fur- nish light when no engines are oper- ated and the vessel is tied to the dock. Four Lynn stone filters are in- stalled complete with chlorinator, so that the vessel can make its own fresh water from river water in case of necessity. For drinking and cook- ing, there are two 1600 gallon tanks that can be filled from shore. Fresh water is used exclusively for all wash basins, showers and toilets. Hot water for the ship is provided by the hot water boiler in the galley. There is, however, additional supply for hot water from a simple coil installed in the starboard main engine exhaust header. A 250 gallon hot water boiler is installed in the engine room in series with the 100 gallon hot water boiler in the galley. This will give all the hot water necessary, and is simple and inexpensive. Heating and Refrigeration A Crane house boiler installed in the engine room provides for heating the vessel. All radiators used are the latest copper fin type. These radia- tors require very little space, and only a fraction of weight compared with the old type cast iron radiators. A Baker refrigerating and ice mak- ing plant is provided to manufac- ture 125 pounds of ice in 24 hours, and cool the vegetable and meat rooms. The plant is entirely auto- matic, controlled by thermostats. The steering gear machines are manufactured by the American En- gineering Co. They are of the hydrau- lic type, and each machine is oper- ated by a three horsepower motor. © Engine pit of Towboat Coin- er looking aft. One of the main propelling shafts. Auxili- aries ® There are two sets of forward rud- ders and two after sets. The rud- ders are of the balanced type carried in ball bearing races. The vessel is equipped with a com- plete radio outfit for sending and re- ceiving. There are four fire plugs on main deck and three on upper deck. In addition, there is a fixed carbon- dioxide system for protection against fire in the paint, oi! and lamp room, and engine room pit, by the total flooding method. Two hose-reel car- bon-dioxide fire extinguishers, each with 50 feet of hose, are independ- ently installed in accessible positions in the engine room. Deck Machinery There are two double barrel cap- stans, built by Marietta Mfg. Co., mounted on the forward end of ves- sel, and one on after end, each op- erated through spur and worm gear by a 20 horsepower motor. Electric hauling winches of Amer- ican Engineering Co. make are in- stalled on port and starboard side in forward end of engine room. These winches are operated by 10 horse- power motors. There are no special pumps in- stalled in the vessel to pump barges. Instead, there are 4 portable electric- ® Complete mod- ern laundry with electric- ally operated washing and ironing ma- chines. Tow- boat Coiner 4 MARINE REVIEW—June, 1935 driven barge pumps, manufactured by W. F. Stuckeman & Co., Pitts- burgh. These pumps can be carried by one man by dismantling the mo- tor, or easily by two men when fully assembled. Trial Trip Results The official trials, conducted on March 25, 1935, proved that calcu- lations for machinery and equipment were correct. The propeller design on the Coiner exceeded the highest expectations of her designers. The vessel made a speed of 13.3 miles per hour in still water at its rated engine speed of 250 revolutions per minute, each engine developing 650 brake horsepower. The apparent pro- peller slip was 6.3 per cent. In the backing test, the boat, going down- stream at a speed of 17 miles per hour, came to a dead stop in approx- imately 50 feet, with the engines turning 300 revolutions per minute. The performance of the propellers on the Coiner is a new milestone for river craft, and a blow to the old paddle wheel design. One man in the engine room did all of the maneuvering on both en- gines from the control stand. The control seemed almost human in its operation, and the telegraph orders were answered without delay of any kind. Contract has been awarded by the United States engineer office, Kansas City, Mo., to the Dubuque Boat & Boiler Works for the construction of one 250-horsepower survey boat, us- ing Fairbanks, Morse & Co. diesel engine, on its bid of $61,800, received March 6. Heavy cruiser No, 39, the U. S. S. QuINCY, now building at the Fore River plant of the Bethlehem Ship- building Corp., Quincy, Mass., is scheduled for launching on June 19. The sponsor is to be Mrs. Henry S. Morgan, daughter of former Secre- tary of the Navy Charles Francis Adams, 23