Which constraint limited the consistency of early cast iron cannon barrels?

💡 Explanation

Variable carbon content led to unpredictable brittleness in cast iron because of poorly regulated carburization and decarbonization during smelting. Therefore, cannons often burst rather than firing reliably because phase transitions altered the material strength.

• Which risk increased for Roman legionary roads laid upon estuarine mudflats?
• Which outcome increased the risk to Roman aqueducts using Trajan's bridge design?
• Which optical outcome occurred in Alhazen's pinhole experiments used to investigate image formation?
• Which outcome occurred because Viking longship square sails experienced deformation at high latitudes?
• Which navigational consequence arises when estimating longitudinal position solely through celestial observation?
• Which unintended consequence occurred as pinhole cameras allowed Alhazen to better safely study solar eclipses, relying only on geometrical observations of light?