Gem testing
This unusual work is a complete treatise on the identification of precious stones that is thoroughly recommended for inclusion on the jeweller or antiquarian's bookshelf. Contents Include: Preface; How to Use The Book; Refractive Index and its Measurement; Double Refraction and How to Detect it...
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| Format: | EBOOK |
| Language: | ENGLISH |
| Published: |
Read Books Ltd
2011
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