4132 HYDROGRAPHIC MANUAL PaGE 322 



4,460 gallons of Diesel oil. The engines are designed for fresh water cooling with heat exchangers. 

 Located in the stack are surge tanks for the propelling Diesels and silencers for the main engine exhausts 

 and the auxiliaries. 



Below deck are, from bow to stern, a forepeak and chain lopker, a forecastle, engine room, ward- 

 room, and lazaret. In the forecastle are 12 built-in berths for the crew. The engine room is 15^ 

 feet in length. In addition to the Diesel engines, it contains two 28-hp Diesel-powered auxiliary 

 units, each consisting of an electric generator, an air compressor, a fuel-oil transfer pump, an all- 

 purpose water pump, and a heat exchanger complete with fresh and raw water pumps. Both units 

 are cross-connected to alternate their duties. The wardroom contains accommodations for three 

 officers, various lockers, the Commanding Officer's desk, and a table. 



On the upper deck, the pilothouse is in the forward end of the deckhouse. The crew's messroom, 

 extending the full width of the deckhouse, is located amidships, and aft of it is a complete galley, 

 equipped with an oil-burning range. In the after end of the deckhouse are the cold storage compart- 

 ment, a refrigerating room, and mess stores lockers. The companionway to the wardroom below is 

 located amidships. 



There are two Diesel oil tanks and two fresh water tanks forward and two of each aft. The total 

 fresh water capacity is 2,500 gallons. 



The fire-control system includes two automatic remote-control CO2 extinguishing systems, one in 

 the engine room and the other in the lazaret and paint locker. 



4132. Equipment of the '*E. Lester Jones** 



The navigation equipment installed in the pilothouse of the E. Lester Jones includes a photo- 

 electric pilot for automatic steering (similar to a gyro pilot but actuated by a magnetic compass) and a 

 radio direction finder, in addition to the standard equipment carried by vessels of this size. Visibility 

 from the pilothouse in rain or heavy weather is aided by an electrically operated clear-view screen. 

 Also installed in the pilothouse is a complete sending-and-receiving radio set. 



The sounding equipment consists of a Dorsey Fathometer No. 3 for echo sounding and an LL-type 

 sounding machine with stranded wire for vertical casts. The former is located in the pilothouse and 

 the latter on the port deck. 



In addition to the sounding equipment, the vessel is equipped with the usual survey instru- 

 ments, including theodolites, alidades, portable tide gages, sextants, etc., of the latest types and design. 



Four small boats provided with outboard motors are carried; two 16-foot dinghies for lifeboats 

 and two dories for landing parties ashore. The dinghies are stowed in chocks on the upper deck and 

 the dories are carried on the afterdeck, being lowered and hoisted by a small boat boom. 



42. SURVEY LAUNCHES AND SMALL BOATS 

 421. General Description of Survey Launches 



Most of the launches used in hydrographic surveying are open or partly decked 

 30-foot boats, propelled by internal combustion engines, with a maximum speed of 

 approximately 8 knots, but which can be run continuously, without choking, at the slow 

 speeds of 2 or 3 knots during the development of shoal areas. The launches are used 

 for sounding inshore and for the development of shoals or shoal indications where a ship 

 or auxiliary vessel cannot operate safely or economically. They are also used to trans- 

 port shore survey parties to and from their work. Since the launches operate from a 

 ship, camp, or shore headquarters, living accommodations and storage space for supplies 

 are not required. 



Portable depth recorders are used for echo sounding from most survey launches. 

 They reproduce a profile of the bottom in depths up to 160 fathoms and permit running 

 the launch at full speed. This method of sounding has replaced the old handlead and wire 

 methods to a large extent, and results in more progress and a more accurate survey. 

 Many of the launches are also equipped for radiotelephone communication with each 

 other, the mother ship, or shore parties. 



