(1) Grid Method:
In this method a grid, which is a matrix or horizontal and vertical lines which are equidistant, is drawn with a pencil on the original material which is small. Another grid is drawn with a larger scale on the chart paper. Maintaining the proportions and direction the figure is hand drawn on the chart paper while referring to the original. The grid here acts as a guideline for enlargement.
(2) Projection Method:
The original materials projected on to a blank chart paper fixed on a board/wall using epidiascope, if it is on a transparency. With the help of the image, which is adjusted for its size, pencil sketch is made which subsequently is made permanent by working on the pencil sketch over a table.
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(3) Pantograph Method:
A pantograph is a mechanical device in which lead-point traces out the enlargement of a figure moved over by a pin-point tracer; while one point is held stationary. Adjustable pantographs are available which can enlarge the original figure up to five times.
(4) Colouring:
Use of colour makes a visual appealing and helps a student grasp distinctions. But unimaginative use of colour may spoil the appeal of an otherwise appealing content. Colour has three basic properties – hue, value and intensity. Hue is what we ordinarily mean when we talk of a specific colour such as red, orange or blue. Value is the relative lightness or darkness of a colour. Intensity refers to the relative strength or weakness which ordinarily is referred as brightness or dullness. While selecting a colour one could be more specific if one takes into account the three properties. While using more than one colour, it is necessary to take into account the colour harmony. On the colour wheel, colours are arranged in a definite order. With the help of the wheel, it is possible to identify colours which are adjacent or opposite to one another.