PC 01.479

Bull's Eye

Rafferty, Mary M; Amer. Gemcutter, Aug 92, p29

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L/W: 101%
Design RI: 1.54
H/W: 91%
Gear: 120
V/W³: 0.321
Symmetry: 60
Facets: 113
Tiers: 12
Crown: 15
Pavilion: 98

Crown is done in freewheel position; alternate bands unpolished (frosted). Facet count 45+15

Wireframe

Bull's Eye 3D view

Top view

Side view

Front view

Back view

Pavilion

#	Angle	Facets	Notes
G1	90.00°	120 8 16 24 32 40 48 56 64 72 80 88 96104112	Establish girdle and size.
P1	55.00°	120 8 16 24 32 40 48 56 64 72 80 88 96104112	Level girdle.
P2	50.76°	4 12 20 28 36 44 52 60 68 76 84 92100108116	Meet P1-P1-P2-P2
P3	50.15°	120 8 16 24 32 40 48 56 64 72 80 88 96104112	Indeterminate.
P4	43.00°	120 8 16 24 32 40 48 56 64 72 80 88 96104112	Cut to PCP

Crown

#	Angle	Facets	Notes
C1	60.00°	120 8 16 24 32 40 48 56 64 72 80 88 96104112	Match pavilion / form girdle width
C2	50.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel. Leave unpolished.
C3	40.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel to cut conic section.
C4	30.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel. Leave unpolished.
C5	20.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel.
C6	10.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel. Leave unpolished.
C7	5.00°	120 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98100102104106108110112114116118	Freewheel.