Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 128
ere the parallels intersect the centralmeridian L M, and apply and mark off these points along the equatorial diam-eter A A. Draw meridians with centres on the extension of the line of theequator intersecting the points marked off on this line, and meeting at the poles.Stereograpliic Projection…
Mechanical drawing
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