Which limitation appears when reflected sunlight exceeds design limits of 18th-century sextants?

💡 Explanation

Excessive sunlight exposure heats the bi-metallic strip in the horizon mirror mount, triggering differential thermal expansion. This causes mirror desilvering because the expanding metal compresses silver. This mirror degradation reduces useful sextant life rather than affecting parallax or timekeeping.

• Which consequence resulted for 18th-century warships using iron ballast?
• Which risk increased during medieval siege bridge construction, as individual bridge sections extended?
• Within a 1790s-era square-rigged ship, what risk increased when dissimilar metals contacted seawater?
• Which risk increases when lime mortar carbonation in Cyclopean masonry decreases?
• Which outcome arises in historical pietra dura mosaics due to inconsistencies?
• Which limitation constrained early Chinese trebuchet projectiles using black powder?