On Conoids and Spheroids

"On Conoids and Spheroids" is a notable work by the mathematician Giovanni Battista Venturi that was published in 1719. The treatise addresses the geometric properties of conoids and spheroids, which are forms generated by rotating curves around an axis. **Conoids** are surfaces generated by rotating a conic section (like a parabola) around an axis. They can exhibit interesting properties, such as the ability to create areas of uniform density when shaped correctly.