GemCad Derived Rendering by Bob Keller

SRB Variation with 16 Fold Symmetry | |
---|---|

Angles for R.I. = 1.54 | 113 facets + 32 facets on girdle = 145 |

16-fold, mirror-image symmetry | 64 index |

L/W = 1.000 T/W = 0.629 T/L = 0.629 P/W = 0.442 C/W = 0.109 | H/W = (P+C)/W+0.02 = 0.572 P/H = 0.774 C/H = 0.191 |

Vol./W^3 = 0.186 | Brightness at 0 degrees tilt for R.I. = 1.54
COS = 89.8% ISO = 93.8% |

Pavilion | |||
---|---|---|---|

pb | 42.00 | 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31- 33-35-37-39-41-43-45-47-49-51-53-55-57-59-61-63 | Cut to temporary center point |

g | 90.00 | 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31- 33-35-37-39-41-43-45-47-49-51-53-55-57-59-61-63 | Cut to meet pb |

pm | 41.50 | 64-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60 | Cut to meet pb,g |

Crown | |||

cb | 32.00 | 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31- 33-35-37-39-41-43-45-47-49-51-53-55-57-59-61-63 | Cut to meet g - level girdle |

cm | 30.50 | 64-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60 | Cut to meet cb,g |

s | 25.00 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62 | Cut to meet cb,cm |

t | 0.00 | Table | Cut to meet s,cm |

This variation of the SRB doubles the number of facets in each course by increasing the symmetry from 8 fold to 16 fold. Increasing the number of facets increases the scintillation and is a way of scaling up the SRB to work with larger stones. Note that this variation is cut with a 64 index. |