Cagniard de La Tour siren Calefation apparatus. Leidenfrost's drops Camera Camera obscura Cartesian diver (or devil) Cast-iron freezing bomb Cavendish hemispheres Centrifugal track Centrifugal ventilating fan Capillary tube Compensated pendulum Compression fountain Concave parabolic mirrors Condensing electroscope Conical prism

Convex spherical mirror Coulomb's torsion balance Crookes' radiometer Crookes' tube with three anodes Cryophorus Cryptoscope Cubical mirror Cylinder with perforated arrow Cylindrical mirror Cylindrical tube