Faraday dark space

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noun Physics.

the dark region between the negative glow and the positive column in a vacuum tube occurring when the pressure is low.

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Origin of Faraday dark space

First recorded in 1890–95; named after M. Faraday

He wore white gloves, a dignified long black coat, and matching pants and vest, and he carried a dark walking stick.
The Black Man Who Replaced Jefferson Davis in the Senate|Philip Dray|January 7, 2015|DAILY BEAST
I thought about the mother, her fear of the dark, of the harm she feared might come to her daughters.
I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003|Vicky Ward|January 7, 2015|DAILY BEAST
Then she managed to struggle a mile through dark, rainy woods.
The 7-Year-Old Plane Crash Survivor’s Brutal Journey Through the Woods|James Higdon|January 7, 2015|DAILY BEAST
These are dark times for network TV, but experiments like Galavant are the silver lining.
‘Galavant’: A Drunken, Horny Musical Fairy Tale|Melissa Leon|January 5, 2015|DAILY BEAST

Luke Skywalker is an evil robot who has fallen to the dark side of the force.
Juiciest ‘Star Wars: The Force Awakens’ Rumors (and Some Debunked Ones)|Rich Goldstein|January 3, 2015|DAILY BEAST
Ripperda's eye fell upon the mantle,—it was discoloured a dark red in many places, he nodded his head, and the man withdrew.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
He glanced aside, and saw an exceedingly pretty, dark face, which looked vaguely familiar.
Rosemary in Search of a Father|C. N. Williamson
Down in his galleries and chambers where it was dark as a pocket Grandfather Mole enjoyed himself thoroughly.
The Tale of Grandfather Mole|Arthur Scott Bailey
His dark, shining, almost too intelligent eyes looked at Nigel, and looked away.
Bella Donna|Robert Hichens
The seeds of some species are of a dark brown while others are of a lighter shade.
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.