Which risk increases when a brass astrolabe suffers dezincification?

💡 Explanation

If selective leaching removes zinc from the brass, its alloy undergoes substantial weakening; this is because diffusion causes grain boundary weakening, decreasing resistance to deformation rather than preserving structural integrity; therefore the instrument becomes fragile.

• During zenith-star observations using an astrolabe, which consequence results when sights are not perpendicular to the plate?
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• Which maintenance risk increased for Brunelleschi's dome because mortar recipes changed?
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