Technical lettering

Engineering drawings use a Gothic sans-serif script, formed by a series of short strokes.

To regulate lettering height, commonly 3 mm (1⁄8-in), guidelines are drawn.

wider than the upper parts, or by drawing the horizontal line at the center of these letters just above their geometric axis.

Mechanical lettering is sometimes done using a pantograph, a device consisting of four bars ("links") which are pinned to each other to form a parallelogram.

One vertical link at one end is connected to a profile tracer, which traces the profile of the letter to be drawn, and the second vertical link and the other horizontal link are jointly connected to a pencil that draws the exact shape of the profile traced.