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EQUIPMENT AND INSTRUMENTS 



413 



supplies, stationery, etc. In addition to the regular electric illumination of tlie room, a special 

 fluorescent lamp of the daylight type is installed above each drafting table to provide near shadow- 

 elimination. Two drafting tables, similar to those in the drafting room, are installed in the pilothouse. 

 An adequate supply of theodolites, alidades, portable tide gages, sextants, protractors, binoculars, 

 etc., of the latest types and design is included in the survey equipment. 



413. Motor Vessel "E. Lester Jones" 



One of the most modern auxiliary vessels of the Coast and Geodetic Survey is the 

 twin-screw Diesel-powered wooden motor vessel E. Lester Jones. The dimensions are 

 an over-all length of 88 feet, a breadth of 21 feet, and a normal draft of 8 feet. The 

 vessel is designed for an independent survey unit, equipped with all the essential items 

 found in the larger surv(>y ships, except that no power launch is carried. The comple- 

 ment consists of 3 officers and 12 men. 



Figure 72.— Motor vessel E. Lester Jones. The E. Lester Jones is 88 feet Ions, 21 feet beam, and S feet draft. Her complement is 'i 



officers and 12 men. She operates as an independent unit. 



4131. General Description 



The hull is stoutly built, with keel, double flitch-frames, planking, ceiling, and decks of Douglas 

 fir. All lumber has been pressure-treated with "Wolman" salts for protection against dry rot and 

 decay. All hull fastenings are of Monel metal and others are bronze. There are four watertight steel 

 bulkheads. 



The hull design is full with good freeboard, a straight stem, well-flared bow, and elliptical over- 

 hanging stern. There is a large deckhouse and considerable open deck space. Some of the chaiacter- 

 istics of a halibut schooner are embodied in this able, trim craft. 



The propelling machinery consists of two Diesel engines, each rated at 150 hp at 500 r.p.m. 

 The ves.sel has a maximum speed of 10 knots, a cruising radius of 3,000 miles, and a fuel capacity of 



