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3 mm scale, also known as 3 mm finescale, is a model railway scale of 3 mm : 1 ft (305 mm) used for British prototypes. Introduced as British TT gauge , it sits approximately halfway between British N gauge and OO gauge but is not as popular as either and there is no longer any mass manufacturer ready-to-run support.
The pica is a typographic unit of measure corresponding to approximately 1 ⁄ 6 of an inch, or from 1 ⁄ 68 to 1 ⁄ 73 of a foot. One pica is further divided into 12 points. In printing, three pica measures are used: The French pica of 12 Didot points (also called cicero) generally is: 12 × 0.376 = 4.512 mm (0.1776 in).
T scale, using 3 mm gauge track to represent standard gauge railways. 1:450: 0.677 mm: Model railways (T) T scale, using 3 mm gauge track to represent 3 ft 6 in (1,067 mm) gauge railways. Hasegawa also produces plastic ship models in this scale. 1:432: 0.706 mm The scale used during World War II by the U.S. Navy for aircraft recognition. 1:426: ...
The French National Print Office adopted a point of 2 ⁄ 5 mm or 0.400 mm in about 1810 and continues to use this measurement today (though "recalibrated" to 0.398 77 mm). [ 21 ] [ 22 ] [ 23 ] Japanese [ 24 ] and German [ 9 ] [ 16 ] [ 18 ] standardization bodies instead opted for a metric typographic base measure of exactly 1 ⁄ 4 mm or 0.250 ...
For example, "agate" and "ruby" used to be a single size "agate ruby" of about 5 points; [2] metal type known as "agate" later ranged from 5 to 5.8 points. The sizes were gradually standardized as described above. [ 3 ]
While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm (0.65 in) gauge from real life prototype 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.
The traditional typographic units are based either on non-metric units, or on odd multiples (such as 35 ⁄ 83) of a metric unit.There are no specifically metric units for this particular purpose, although there is a DIN standard sometimes used in German publishing, which measures type sizes in multiples of 0.25 mm, and proponents of the metrication of typography generally recommend the use of ...
Examples include a 3-dimensional scale model of a building or the scale drawings of the elevations or plans of a building. [1] In such cases the scale is dimensionless and exact throughout the model or drawing. The scale can be expressed in four ways: in words (a lexical scale), as a ratio, as a fraction and as a graphical (bar) scale.