Gnomonic Projections on Two Planes

John W. Evans

Mineralogist to the Scientific and Technical Department of the Imperial Institute.

Mineralogical Magazine; May 1906 v. 14; no. 65; p. 149-156; DOI: 10.1180/minmag.1906.014.65.05
© 1906, The Mineralogical Society
Mineralogical Society (www.minersoc.org)