Smithsonian Bar
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| GemCad Ray Traces for RI = 1.62 | ||
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| Random Model | Cosine Model | ISO Model |
| Smithsonian Bar Designed by Jeff Graham jeff@faceters.com | |
| Angles for R.I. = 1.62 | 25 facets + 8 facets on girdle = 33 |
| 2-fold, mirror-image symmetry | 96 index |
| L/W = 1.500 T/W = 0.862 T/L = 0.575 P/W = 0.482 C/W = 0.212 | H/W = (P+C)/W+0.02 = 0.714 P/H = 0.675 C/H = 0.297 |
| Vol./W^3 = 0.632 | Brightness at 0 degrees tilt for RI = 1.62 COS = 75.7 ISO = 86.7 |
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| Pavilion | |||
|---|---|---|---|
| P1 | 47.00 | 96-48 | Cut to center. |
| P2(G) | 90.00 | 96-48 | Cut a level girdle. |
| P3 | 70.78 | 24-72 | Cut to whatever L/W desired. |
| P4(G) | 90.00 | 24-72 | Cut level girdle. |
| P5(G) | 90.00 | 12-36-60-84 | Cut corners, if desired… |
| P6 | 43.99 | 96-48 | Cut equal step. |
| P7 | 41.00 | 96-48 | Cut equal step. |
| P8 | 62.51 | 12-36-60-84 | Cut to meet girdle, P1. |
| Crown | |||
| C1 | 72.00 | 96-48 | Cut to meet girdle. |
| C2 | 45.33 | 12-36-60-84 | Cut to meet girdle. |
| C3 | 28.00 | 24-72 | Cut to meet girdle. |
| C4 | 18.00 | 24-72 | Cut a level step, meet C2. |
| C5 | 8.00 | 24-72 | Cut a level step. |
| T | 0.00 | Table | Cut table same size as steps. |
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