This paper introduces the process of making "nine dragon" tripod vessel and describes the technology and key for casting the body by lost wax pattern plaster mold process in detail.

前言： 简述了“九龙鼎”的制作过程，详细介绍了用熔模石膏型铸造大型鼎身的工艺及要点。

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The key issues for bronze gnomon casting with integrated and clear surface in investment casting in plaster mold involves to prevent large plate from deformation and to ensure full mold filling.

日晷由锡青铜铸造，其铸造技术的关键是防止大平面的变形和保证良好的充型以获得完整、清晰的表面。

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