Century Dictionary and Cyclopedia
- n. A fluorescent screen, with a hood, for the observation of bodies under the action of X-rays; a *fluoroscope (which see, with cut).
“Salvioni to this sort of "spy-glass" -- if one may apply this term to an instrument which has no glass -- is that of "cryptoscope" (seeing that which is hidden).”
“Salvioni of Perugia has invented a "cryptoscope," which enables us to see the hidden object without the aid of photography by allowing the rays to fall on a plate coated with one of these phosphorescent substances.”
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