|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||5 days ago||65.86||$48.95||You save $16.91|
|Amazon US||yesterday||60.71||$48.95||You save $11.76|
Preface; 1. Introductory; 2. Origin of physical theories; 3. Relation of theories to experience; 4. Chromatic phenomena produced by crystals on polarized light; 5. Range of vision incommensurate with the range of radiation; 6. Principles of spectrum analysis; Appendix; Index.