Conic Section Model, ca 1900. Object 1979.3002.021, Smithsonian Image DOR2013-17883. Less common are kinematic models. These devices depict mathematical concepts that involve motion. The models can be ...

Solid Geometry and Conic Sections, with Appendices on Transversals, and Harmonic Division, for the Use of Schools. By J. M. Wilson Second Edition. (Macmillan and Co., 1873.) ...