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  2. Technical pen - Wikipedia

    en.wikipedia.org/wiki/Technical_pen

    The solution was to stick down a plastic sheet that attracted the film more strongly than the drafting instruments. The tracing paper or velograph sheet would be placed on the Ozalid sheet stuck onto the drawing board and the air brushed away. Brushing charged the surface, and the film would then be taped taut (but released at the end of each ...

  3. Mechanical pencil - Wikipedia

    en.wikipedia.org/wiki/Mechanical_pencil

    A typical construction of a ratchet-based mechanical pencil. A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead, often made of graphite, is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from ...

  4. Technical drawing tool - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing_tool

    Smaller drawing boards are produced for table-top use. In the 18th and 19th centuries, drawing paper was dampened and then its edges glued to the drawing board. After drying the paper would be flat and smooth. The completed drawing was then cut free. [3]: 1-2 Paper could also be secured to the drawing board with drawing pins [4] or even C-clamps.

  5. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    A list, usually tabular and often on the drawing (if not accompanying the drawing on a separate sheet), listing the parts needed in an assembly, including subparts, standard parts, and hardware. There is no consistently enforced distinction between an L/M, a BoM, or a P/L. PLM: product lifecycle management; plant lifecycle management: See also ...

  6. Comparison of computer-aided design software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_computer...

    CAD refers to a specific type of drawing and modelling software application that is used for creating designs and technical drawings. These can be 3D drawings or 2D drawings (like floor plans ). Title and developer

  7. Rotring - Wikipedia

    en.wikipedia.org/wiki/Rotring

    That same year Rotring launched its first drawing board, and the "Tikky" mechanical pencil was released in 1979. The "Art Pen", a fountain pen suitable for calligraphy, was launched in 1984. During the decade, Rotring set new subsidiaries in other European countries, while the "600" mechanical pencil was introduced in 1989.