Five questions on lesson 3 of The history of the brilliant. The questions and the answers to pick from come in a new order every time you start.
Pick an answer, and the question marks itself. For a question that you answer in your own words, think of your answer first. Then show our answer and say whether you had it. Nothing is saved or sent.
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Question 1: What are the three facet types on a modern crown, and how many of each?
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8 bezels, 8 stars, 16 upper girdle halves: 32.
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Question 2: Who doubled the crown from 16 to 32 facets?
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b: Vincent Peruzzi, a Venetian polisher.
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Question 3: The Peruzzi scores 81 for scintillation and the T73 80. What does that tell you?
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b: The Wheel counts scintillation from the facets: 74 against 73.
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Question 4: Name the two reasons Tolkowsky gave for the Peruzzi's dullness.
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Too great a thickness, and corner and side facets cut at different angles.
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Question 5: Which Wheel row shows the cushion problem, and what does it read?
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Symmetry: 85 against the T73's 100, "a less regular pavilion".
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