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Saturday 23 February 2013

Dimensions Of Letters

  • The Nominal Size of lettering is defined by the height (h) of the outline contour of the upper-case (capital).
  • Central Line is the imaginary line in the middle of each line or line element which is a constitutive part of a graphic character set.
  • If we consider d as the width of the line element and h as the height of the line element, then the two standard ratios for d/h are: 1/14 and 1/10, which are feasible because they result in a minimum number of line thicknesses.
  • Location of Central Lines- The nominal size (h) and the spacing between characters (a) shall be taken as the basis for defining the central line.
  • Range of Nominal Sizes -The range of nominal sizes are 2.5 mm ;3.5mm ; 5 mm; 7 mm; 10 mm; 14 mm; 20 mm;
  • The multiple of 1.414(square root of 2) is the range of heights for lettering is derived from the standardized progression of dimensions for paper sizes.
  • Lettering Angle-The lettering may be vertical (upright) or inclined (sloped) to the right at 75° from the horizontal.
  • The spacing between two characters may be reduced by half, if this gives a better visual effect.
  • various letters are divided into no. of parts so that dimensions will be accurate.
  • The size of letter is described by its height. According to the height of letters, they are classified as :


Lettering A

CharacteristicParameterRatioDimensions(mm)
Lettering Height
(Height of capitals)
h(14/14)h2.53.557101420
Height of lower case letters
(without stem or tail)
c(10/14)h-2.53.5571014
Spacing between charactersa(2/14)h0.350.50.711.422.8
Minimum spacing of base charactersb(20/14)h3.55710142028
Minimum spacing between wordse(6/14)h1.051.52.134.268.4
Thickness of linesd(1/14)h0.180.250.350.50.711.4

Lettering B

CharacteristicParameterRatioDimensions(mm)
Lettering Height
(Height of capitals)
h(10/10)h2.53.557101420
Height of lower case letters
(without stem or tail)
c(7/10)h-2.53.5571014
Spacing between charactersa(2/10)h0.50.711.422.84
Minimum spacing of base charactersb(14/10)h3.55710142028
Minimum spacing between wordse(6/10)h1.52.134.268.412
Thickness of linesd(1/10)h0.250.350.50.711.42

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