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For correct lettering an auxiliary grid should be drawn by thin lines. The vertical and
horizontal grid step is equal to thickness of heavying in of the font.
The main requirements for lettering are
1. Legibility
2. Uniformity
3. Ease of writing
4. Rapidity of execution.
Single stroke letters meet these requirements and are universally used. Good lettering should
conform to uniformity of thickness, style, scope, size and spacing.
Modern Roman — Refer to Fig. 1.6.
Figure 1.6 – Fonts
Conventional Representation of Materials State Standard 2.306-68*
A variety of materials are used for making machine components. It is therefore preferable to
follow different conventions of section lining for different materials as given in Table 1.4.
Table 1.4 – Conventional Representation of Materials
Material Denotation
Metals and hard alloys
Non-metal materials, after the exception of indicated below
Wood
Ceramics and silicate materials
Glass and transparent materials
Liquids
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