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Left:
center right, since even one misplaced hole for a bolt could concentrate
the stress and cause the glass to fracture, left
Right:
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Left:
Macfarlane and his colleagues spent months testing glass beams.
A model of the shipping container, below right, shows the subway
canopy after it was fabricated in London.
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Engineers
have a hard time creating glass structures because there isn't enough
information available. "Every other material has engineering specifications,"
Macfarlane says. "But it never happened for glass.
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Left
/ Right:
Glass
has been used in unlikely places before, like the treads on this
London staircase by Eva Jiricna,
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Right:
Macfarlane's
first sketch of the canopy, made over dinner at a Chinese restaurant
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