🔍 Key Concepts

• Shell plating fabrication methods used in shipbuilding • Difference between plates that are flat, simply curved (one direction), and doubly curved (two directions) • When plates must be heated and hammered over forms versus just passed through rolls

💭 Think About

• Which term is normally used for a plate that has to be shaped to fit a hull surface curved both longitudinally and transversely? • Which of these options clearly does NOT describe a flat or single‑curvature plate formed only by rolling? • Think about what extra work is implied when special forms, heating, and hammering are required—what does that say about the type of curvature?

✅ Before You Answer

• Eliminate any choice that obviously means no curvature or only very simple shaping • Identify which term you’ve seen in ship construction texts for doubly‑curved shell plating • Ask: which name logically suggests an extra, more complex forming process beyond ordinary rolling?