Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 376
formula forobtaining the reduced square degrees ofuninterrupted sky visible from a desk.If m is the perpendicular distance of thedesk from the window wall, n its hori-zontal distance in the plane of this wallfrom the point on the window corres-ponding to the centre of visible sky, o thevertical… … By the aid of this formula and a know-ledge of the average variation in daylightillumination throughout the day andyear, it should be possible to calculatewith fair exactitude the average direct * When a luminous surface is said to have asurface-brightness of so many foot-candles thismeans that its…
Lighting
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