On a Protractor for Use in Constructing Stereographic and Gnomonic Projections of the Sphere

A. Hutchinson

Demonstrator of Mineralogy in the University of Cambridge

Mineralogical Magazine; November 1908 v. 15; no. 69; p. 93-112; DOI: 10.1180/minmag.1908.015.69.01
© 1908, The Mineralogical Society
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