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C.V.  Of Brad
 Home Page
List of PDF files
 Photo Album
 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
UltraTec  Faceting
PDF Files: can be opened with Adobe Acrobat Reader
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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