Drwing with Rotring capilliary pens, ISO lettering templates, in later years using rub-down lettering. Drawings were done with ink on transparent film, and archived in huge suspension cabinets, or rolled in cardboard or linen sleeves. they were reproduced on dye-line machines, hencecthe name ''blueprint'. read more
Computer-aided design is one of the many tools used by engineers and designers and is used in many ways depending on the profession of the user and the type of software in question. read more
Computer-aided design (CAD) involves creating computer models defined by geometrical parameters. These models typically appear on a computer monitor as a three-dimensional representation of a part or a system of parts, which can be readily altered by changing relevant parameters. read more