Bible Dictionaries
Tachistoscope

Webster's Dictionary

(n.) An apparatus for exposing briefly to view a screen bearing letters or figures. It is used in studying the range of attention, or the power of distinguishing separate objects in a single impression.

Bibliography Information
Webster, Noah. Entry for 'Tachistoscope'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tachistoscope.html. 1828.