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.
Technical Lettering. Similar to ISOCP font, available in AutoCAD.