International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 17
wire are wound „, ^. „,. around the south end rPlatinum Wire. . , i, / t^- liV of the needle (see Fig. h^Pivot. 2J:»)» keeping it per- fectly balanced uponFig. 246. its pivot and permit- ting entire freedom of movement. These coils of wire atonce indicate to the observer which is the north end… … Fi(^ -is;-. vertical slits, with holes at their top and bottom, divide thisbar, as shown at C and D. These arrangements enablethe observer to train the line of sight upon any desiredobject. PURVEYING. 60^ 1 200. The Divided Circle.—The compass box con-tains a graduated circle divided to half…
Railroad engineering
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