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  2. Window blind - Wikipedia

    en.wikipedia.org/wiki/Window_blind

    Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

  3. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

  4. Window covering - Wikipedia

    en.wikipedia.org/wiki/Window_covering

    The height of the blind and the angle of the slat can be determined by daylighting demand and solar positions (azimuth, altitude). By controlling the height of shades or blinds, the optimal amount of sunlight can be introduced to meet the target horizontal illuminance (work plane illuminance). The optimal angle of the blind slats can protect ...

  5. North American Vertical Datum of 1988 - Wikipedia

    en.wikipedia.org/wiki/North_American_Vertical...

    An unusual vertical datum marker at a shoreline street end in Seattle. Based on the more recent surveying techniques and data, it was determined that NAVD 88 is both biased (by about 0.5 meters (1 ft 8 in)) and tilted (about 1 meter (3 ft 3 in) coast to coast). [ 5 ]

  6. Visual field - Wikipedia

    en.wikipedia.org/wiki/Visual_field

    The normal (monocular) human visual field extends to approximately 60 degrees nasally (toward the nose, or inward) from the vertical meridian in each eye, to 107 degrees temporally (away from the nose, or outwards) from the vertical meridian, and approximately 70 degrees above and 80 below the horizontal meridian. [7][1][8][9] The binocular ...

  7. Help:Table - Wikipedia

    en.wikipedia.org/wiki/Help:Table

    Doing the math shows that the height of the top and bottom rows are 3.5 em units each. 3.5 + 3.5 + 7 = 14. If there is wordwrap then the height will increase to accommodate this (except on mobile where the bottom of the table will be cut off).

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