Which navigational risk increased dramatically when constructing iron-hulled ships in the 19th century?

💡 Explanation

When iron ships were built, induced magnetism caused a compass deviation because the iron hull became magnetized influencing the compass needle. Therefore, compass deviation risk increased, rather than corrosion, drag, or brittle fracture which were addressed through different design considerations and material treatments.

• During Roman siege warfare, which effect commonly resulted from undermining a stone fortification wall's foundation?
• Which approach did Al-Khwarizmi use when geometrically 'completing the square' within quadratic equations?
• Which navigational consequence would occur on a 18th-century sailing ship if the chronometer's balance spring experienced thermal expansion?
• Which risk increases when Aztec chinampa agriculture experiences prolonged drought conditions?
• Which mechanism allowed Roman torsion siege engines to achieve high projectile velocities?
• Which benefit arose when Andean terraces used stone walls to retain soil in cultivation systems?