Convex lens Cooke patent Cornu, Gustave Corollaire Corte-Scope Corte-Scope Company Cosmorama Cremer patent Crystal Palace Exhibition Cube Cuny, Émile Curved stereoview D. S. Daguerreotype Daguerreotypist Damoy, Julien Dancer, John Benjamin Day’s Portable Stereoscope Demaria Desktop stereoscope Diableries Diapositive Dioramic Stereoscope Dioskop Direct positive Directoscope Doppelverant Drier, Ferdinand Dry plate Duboscq, Jules E.L.D. Educa (company) Educa (stereoscope)