fulchronograph

noun
ful·chronograph | \ (ˈ)fu̇l , ¦fəl+ \

Definition of fulchronograph 

: a lightning-recording device that consists of a revolving aluminum disk having on its rim several hundred steel fins which, as they pass successively every forty-millionth of a second between two coils carrying the surge current of a lightning stroke, become proportionately magnetized and register the duration and intensity of the strokes

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History and Etymology for fulchronograph

Latin fulgur lightning (from fulgēre to shine, flash) + English chronograph

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