A New Stereographic Protractor1

G. F. Herbert Smith
Assistant in the Mineral Department of the British Museum
1Communicated by permission of the Trustees of the British Museum.

Mineralogical Magazine; December 1913 v. 17; no. 78; p. 46-50; DOI: 10.1180/minmag.1913.017.78.08
© 1913, The Mineralogical Society
Mineralogical Society (www.minersoc.org)