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A pillar box is a type of free-standing post box. They are found in the United Kingdom and its associated the Crown Dependencies and British Overseas Territories , and, less commonly, in many members of the Commonwealth of Nations such as Cyprus , India , Gibraltar , Hong Kong , Malta , New Zealand and Sri Lanka , as well as in the Republic of ...
By expressing a distance in c.t.c., one can measure distances between columns with different diameters without confusion. This concept applies to other architectural features that may have variable diameters/widths and spacings, such as pillars or ceiling beams and baffles.
Some high-definition television networks and TV stations use "stylized pillarboxing", meaning they fill-in the blank areas on the sides with their HD logo or other still or motion graphics, when the program being shown is only available in 4:3 aspect ratio (standard definition).
In 1859 the design was improved, and this became the first National Standard pillar box. Green was adopted as the standard colour for the early Victorian post boxes. Between 1866 and 1879 the hexagonal Penfold post box became the standard design for pillar boxes and it was during this period that red was first adopted as the standard colour.
A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".
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In the past, prints were plotted on a plotter to exact scale ratios, and the user could know that a line on the drawing 15 mm long corresponded to a 30 mm part dimension because the drawing said "1:2" in the "scale" box of the title block.
A reference dimension is a dimension on an engineering drawing provided for information only. [1] Reference dimensions are provided for a variety of reasons and are often an accumulation of other dimensions that are defined elsewhere [2] (e.g. on the drawing or other related documentation). These dimensions may also be used for convenience to ...