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  2. Parallel rulers - Wikipedia

    en.wikipedia.org/wiki/Parallel_rulers

    Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.

  3. Technical drawing tool - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing_tool

    An alternative to the T-square is the parallel bar which is permanently attached to the drawing board. It has a set of cables and pulleys to allow it to be positioned anywhere on the drawing surface while still remaining parallel to the bottom of the board. The drafting machine replaces the T-square and triangles.

  4. Steel detailer - Wikipedia

    en.wikipedia.org/wiki/Steel_detailer

    Traditionally, steel detailing was accomplished via manual drafting methods, using pencils, paper, and drafting tools such as a parallel bar or drafting machine, triangles, templates of circles and other useful shapes, and mathematical tables, such as tables of logarithms and other useful calculational aids. Eventually, hand-held calculators ...

  5. Technical drawing - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing

    Modern drafting tables are equipped with a drafting machine that is supported on both sides of the table to slide over a large piece of paper. Because it is secured on both sides, lines drawn along the edge are guaranteed to be parallel. [3] The drafter uses several technical drawing tools to draw curves and circles.

  6. Engineering drawing abbreviations and symbols - Wikipedia

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

    computer-aided design, computer-aided drafting; cadmium [plating] CAGE: Commercial and Government Entity [code] A CAGE code is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the part defined by the drawing. One corporation can have many CAGE codes ...

  7. Balanced-arm lamp - Wikipedia

    en.wikipedia.org/wiki/Balanced-arm_lamp

    A stronger spring set controls the upper arm, which has three parallel bars (see photo, left). (There is a less stable construction with two parallel bars in the upper arm which is less expensive to manufacture.) Due to the parallel linkage of the lamp, the lamp cap keeps pointing in the same vertical direction when adjusting the height of the ...

  8. Centrolinead - Wikipedia

    en.wikipedia.org/wiki/Centrolinead

    Nicholson's centrolinead is a modification of a pair of parallel rulers. The bar farthest from the vanishing point can be lengthened, being composed of a fixed piece and a sliding piece pinned together. The fixed piece forms an ordinary parallel ruler, with the sliding piece extended out to form a ruler at an angle.

  9. Parallel (engineering) - Wikipedia

    en.wikipedia.org/wiki/Parallel_(engineering)

    A parallel is a rectangular block of metal, commonly made from tool steel, stainless steel or cast iron, which has 2, [1] 4 or 6 faces ground or lapped to a precise ...

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