Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . IFig-. the axis makes it, obviousl}, the correct form. *Foi- a demonstration llie student may refer to Rankines Applied Mechanics, Art. 51. THE TRAGTRIX.—WITCH OF A GNISI. —CARTESIAN OVALS. 71 204. Navigators charts are usually made by Mercator^s projection (so-called, not being a projectionin the ordinary sense, liut with the extended signification alluded to in the remark in Art. 2).Maps thus constructed have this advantageous feature, t
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . IFig-. the axis makes it, obviousl}, the correct form. *Foi- a demonstration llie student may refer to Rankines Applied Mechanics, Art. 51. THE TRAGTRIX.—WITCH OF A GNISI. —CARTESIAN OVALS. 71 204. Navigators charts are usually made by Mercator^s projection (so-called, not being a projectionin the ordinary sense, liut with the extended signification alluded to in the remark in Art. 2).Maps thus constructed have this advantageous feature, that rhumb lines or loxodromics—the curves ona sphere that cut all meridians at the same angle—are represented as straight lines, which can onlybe the case if the meridians are indicated by parallel lines. The law of convergence of meridianson a sphere is, that the length of a degree of longitude at any latitude equals that of a degree onthe equator multiplied by the cosine (see footnote, p. 31,) of the latitude; when the meridians aremade non-convergent it is, therefore, manifestlj^ necessary that the distance apart of originally equi-distant parall
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