07.173 Four by Four BCA

  • Hamer, John;Personal communication 2017;
  • L/W=1.000
  • H/W=0.719
  • Vol/W^3=0.334
  • 40+8 Facets
  • Gear: 96
  • Remarks: BCA=Below the Critical Angle
12 24 36 48 60 72 84 <96> L L W W C C P P a b c a 1 g g2 2 1 g 2 a b a b c a 1 g g2 2 1 g 2 a b PC 07.173 Four by Four. BCA. Designed by J Hamer. July 2014. Copyright assigned to the public domain. Angles for R.I. = 1.540 40 facets + 8 girdles 4-fold symmetry; 96 index L/W = 1.000 P/W = 0.522 C/W = 0.185 Vol/W³ = 0.334 pc07173.asc
139.90°96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90Cut to centerpoint
g90.00°96-24-48-72Size stone
g290.00°12-36-60-84Cut by eye
238.40°09-15-33-39-57-63-81-87Meet 1, 1
a24.36°12-36-60-84Establish girdle
b18.79°05-19-29-43-53-67-77-91Cut to equal width as a
c9.10°12-36-60-84Meet a, b

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