Which limitation was apparent during the Han Dynasty mass production of cast iron tools?

💡 Explanation

The primary challenge with early cast iron tools was silicon segregation during cooling, which produces grain boundary weaknesses because silicon preferentially concentrates at the grain boundaries; therefore brittleness increased rather than if silicon diffused more evenly during solidification.

• Which accuracy limitation arises from aligning an astrolabe to observe a distant landmark at twilight?
• Which primary outcome arises from increased evaporative cooling within a Mughal garden’s 'charbagh' design?
• Which corrective measure significantly reduced position error during celestial navigation using an 18th-century sextant in heavy seas?
• Which navigation outcome arises, because a sextant’s mirrors exhibit parallax error at high angles?
• Which innovation allowed Islamic astronomers, particularly in observatories like Maragheh, to predict planetary positions with increased accuracy?
• Which structural weakness can occur when differential thermal expansion stresses traditional indian "pietra dura" inlay in sandstone?