The three colour convention

These drawings, using views and sections that are superimposed, gain enormously in clarity and ease of reading if the front elevation(s) and sections are left black, side elevations and sections are drawn in blue, and anything that is plan or part plan is drawn in red.

True coloured pencils and not crayons (even if they are encased in wood) should be used and kept sharp.

When the drawing is on paper or plywood the use of this system is well worthwhile. Colours do not come out on dyeline machines (on some machines the blue or the red does not come out at all).

Figure 338 is the same drawing figure as 337, but is finished for another craftsman to make. Its dimensions are given and it is labelled to make it clearer to read. It is also dimensioned in millimetres which has the advantage of avoiding the use of fractions of an inch. Once the common sizes are memorized and immediately related to a specific length, width or thickness, it becomes a most convenient system to use.

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337 Drawn in workshop by craftsman for his ^ own use

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