Bible Dictionaries
Ardois System
Webster's Dictionary
A widely used system of electric night signals in which a series of double electric lamps (white and red) is arranged vertically on a mast, and operated from a keyboard below.
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Bibliography Information
Webster, Noah. Entry for 'Ardois System'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/ardois-system.html. 1828.