Crookes space


  • Webster's Revised Unabridged Dictionary
    • Crookes space (Physics) The dark space within the negative-pole glow at the cathode of a vacuum tube, observed only when the pressure is low enough to give a striated discharge; -- called also Crookes layer.
    • ***


Webster's Revised Unabridged Dictionary
After Sir William Crookes, English chemist, who first described it


In literature:

A little crooked garden occupies the space behind the mosque.
"A Visit to the Holy Land, Egypt, and Italy" by Ida Pfeiffer
I can crook my little finger and swing you off into space at the end of a rope.
"The Short Cut" by Jackson Gregory
And Lille was the Lille he knew: the three crooked boulevards, the jumble of small streets, and open space before the railway station.
"Tam O' The Scoots" by Edgar Wallace
After the observations summarized in these two letters Professor Crookes continued his experiments at his own home, for a space of two months.
"Mysterious Psychic Forces" by Camille Flammarion
Of these, three thousand dined under a great awning in the Tunnel Gardens, one of the open spaces Crooks had secured for the borough.
"From Workhouse to Westminster" by George Haw

In poetry:

Britannia needs no Boulevards,
No spaces wide and gay:
Her march was through the crooked streets
Along the narrow way.
Nor looks she where, New York's seduction,
The Broadway leadeth to destruction.
"Americanisation" by Gilbert Keith Chesterton

In news:

As he huff-and-puffed his way through the crooks and crannies of attics and crawl spaces, the mid-life tire roll he was wearing was obvious.

In science:

Crooked planes were defined by Drumm to bound fundamental polyhedra in Minkowski space for Margulis spacetimes.
Crooked surfaces and anti-de Sitter geometry
They were extended by Frances to closed polyhedral surfaces in the conformal compactification of Minkowski space (Einstein space) which we call crooked surfaces.
Crooked surfaces and anti-de Sitter geometry
The purpose of this note is to show that the crooked planes defined in anti-de Sitter space recently by Danciger-Gu´eritaud-Kassel lift to restrictions of crooked surfaces in Einstein space which are adapted under the involution of Einstein space defining anti-de Sitter space.
Crooked surfaces and anti-de Sitter geometry
In 1990, Todd Drumm introduced crooked planes to build fundamental polyhedra for free discrete groups acting properly and isometrically on 3-dimensional Minkowski space E3 .
Crooked surfaces and anti-de Sitter geometry
In this way our observation is a direct analog in the crooked context. A similar viewpoint was adopted in to develop the theory of metric bisectors in complex hyperbolic space in terms of real analytic hypersurfaces in complex pro jective space Pn C which we called extors.
Crooked surfaces and anti-de Sitter geometry
Now we define crooked planes in anti-de Sitter space, following Danciger-Gu´eritaud-Kassel .
Crooked surfaces and anti-de Sitter geometry
Then we describe how an AdS-crooked plane C determines a crooked plane C in Minkowski space, by a tangent cone construction: C is the tangent cone of C at its vertex p, where the tangent space Tp (AdS3 ) is identified with Minkowski space.
Crooked surfaces and anti-de Sitter geometry
The main difference between crooked planes in AdS3 and crooked planes in Minkowski space is that the particles, the timelike geodesics lying on the stem are compact (homeomorphic to circles) in AdS3 but, in Minkowski space, are lines.
Crooked surfaces and anti-de Sitter geometry
Call the special point corresponding to the improper point in a crooked surface arising from a crooked plane in Minkowski space) the covertex.
Crooked surfaces and anti-de Sitter geometry
Crookes, Hittorf ) dark space - Electrons are either too fast or too slow to excite the gas.
Electron Trapping by Electric Field Reversals in Glow Discharges