162 



Ocean Magnetic Observations, 1905-16 



A 4-cylinder Craig internal-combustion engine of 150 horsepower (PL 8, Fig. 4), 

 sufficient to give the vessel a speed of 6 knots in calm weather, was installed. The 

 gas-producer was furnished by the Marine Producer-Gas Company of New York 

 and consists of a cylinder 6 feet high with a diameter of 5 feet 6 inches, built of 

 copper, with asbestos and firebrick Uning and manganese-steel grates. Anthracite 

 coal is used as fuel, the gas being generated in the producer, taken through a 

 "scrubber," and used explosively in the internal-combustion engine. The vessel 

 carries 30 tons of coal in her bunkers. Non-magnetic manganese steel was used for 

 the doors, grate, and small parts of the producer. The only magnetic material used in 

 the construction of the bronze engine is in the steel valves, piston-rings, cam-springs, 

 and cam-rollers. The total magnetic material was less than 600 pounds. Plate 8, 

 Figures 2-5, shows the various parts and general arrangement of the power plant."^ 



Main GO, SaQ Rlivrt' 



Ul Mil 8«| 8*1] Sbol 



Fig. 9. — Inboard Profile, General Arrangement, and Deck Plan of the Carnegie. 



The ground tackle comprises 4 manganese-bronze anchors of special design — 2 

 being of 1,900 pounds each, 1 of 1,335 pounds, and a kedge anchor of 340 pounds. 

 Three 11-inch cables, each 120 fathoms in length, are required for these anchors. 

 The hawse-pipes, boat davits, chain plates, and all metal deck fittings are of 

 bronze. A fisherman's windlass (see PI. 10, Fig. 4, and PI. 18, Fig. 2), constructed of 

 wood and brass, is used to weigh anchor. (A view of propeller blades is shown on 

 PI. 17, Fig. 3.) 



