At least five full-size mock-ups (above) were produced to test several glazing options and the blind replacements. Studies of solar radiation transmission show the difference between laminated glass units (top left) and single sandblasted panes (left).

tinued. Thicker glass is heavier, of course. The new panels weighed 700 pounds, making them way too heavy for the original stops. In other words, the stops had to be enlarged from % inch to % inch in depth. As the wall sections show, this redesign is subtle enough to be called invisible. However, it has a slope. The architects felt, and the mock-ups confirmed,

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