Silvered and platinized glass (Foucault) (components; concave mirrors; glass mirrors; astronomical instruments)
Circular Glass Mirror, Silver and Platinised, by Leon Foucault, 1857-1868 (components; concave mirrors; glass mirrors; astronomical instruments)
Foucault pendulum explanatory exhibit. (Foucault pendulum apparatus; physics demonstration equipment)
Platinotype print (platinum prints; orthographic drawings; demonstration models; Foucault pendulum demonstrations)