List of PDF files

ba@mrc-lmb.cam.ac.uk

Favourite Links

Brad Amos’s Site cambridge gemcutting optical design confocal microscopy diffractometer SIRA Bio-Rad Cambridge Plymouth Optical Techniques

PDF Files: can be opened with Adobe Acrobat Reader

Birefringence for Facetors II : Why does the possession of two refractive indices cause the light to be split? (Stonechat May 2005)

Birefringence for Facetors III: Getting really complicated. (Stonechat July 2005)

Photographs of topaz sphere cut by Frank Norman (California) as improved illustration to article III. Numbers refer to angular positions around a vertical axis.

Birefringence for Facetors IV : Gems that change colour.
((Stonechat Nov 05)

Brewster Conoscopy: a novel method for determining high refractive indices in gemstones (Microscopy & Analysis March 06)

Hints on Gem Photography (Stonechat July 2007)

What is the best lamp for gemmology? (Stonechat