Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 223
Fhi. 290. 202 DESCRIPTIVE GEOMETRY PCX, § 165 … Fia. 290 (repeated). The meridian which forms the outline of a projection of thesurface, in Fig. 290 the F~-projection, is called the principalmeridian. The plane which contains thismeridian is called the principal meridianplane. The principal meridian plane is al-ways parallel to one of the…
Geometry, Descriptive
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