A Simple Single-Axis Rotation Apparatus

N. H. Hartshorne
Formerly of the School of Chemistry, University of Leeds1
Communicated by Prof. A. Stuart, MSc., F.R.M.S., F.G.S.
1Present address: Ivy Farm, Waldron, Heathfield, East Sussex.

Summary: The apparatus enables a small crystal to be rotated through 360° about an axis parallel to the stage of a polarizing microscope, while immersed in a liquid of known refractive index. Angles of rotation are measured on a graduated drum to the nearest degree. The working distances separating the crystal from the objective and the condenser are sufficiently small for wide-angle interference figures to be obtained. The crystal is easily mounted and centred.

Mineralogical Magazine; December 1963 v. 33; no. 263; p. 693-696; DOI: 10.1180/minmag.1963.033.263.06
© 1963, The Mineralogical Society
Mineralogical Society (www.minersoc.org)