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Skylight, or, why is the sky blue?
As mentioned before, skylight is the light we perceive when looking away from the sun at the sky. Sunlight is the light observed when looking directly at the sun.
Another was a circular opening directly in the middle of the roof, like a skylight in a dome. A third was the big entrance hole of the great perpendicular shaft of which this chamber was an offshoot to the south.
Sheet Metal Work: A Manual of Practical Self-Instruction in the Art of Pattern Drafting and Construction Work in Light- and Heavy-Gauge Metal, Including Skylights, Roofing, Cornice Work, Patterns for Forced-Air Fittings, etc.
 See also: Color, Condition, Stone, Rough, Eye
  
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