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  2. Ruled paper - Wikipedia

    en.wikipedia.org/wiki/Ruled_paper

    Initially, paper was ruled by hand, sometimes using templates. [1] Scribes could rule their paper using a "hard point," a sharp implement which left embossed lines on the paper without any ink or color, [2] or could use "metal point," an implement which left colored marks on the paper, much like a graphite pencil, though various other metals were used.

  3. Line engraving - Wikipedia

    en.wikipedia.org/wiki/Line_engraving

    The paper draws out the ink, and the letter B is printed in intense black. When the surface of a metal plate is sufficiently polished to be used for engraving, the slightest scratch upon it will print as a black line. An engraved plate from which visiting cards are printed is a good example of some elementary principles of engraving.

  4. Ringelmann scale - Wikipedia

    en.wikipedia.org/wiki/Ringelmann_scale

    As proposed in 1888, there was no definitive chart, rather, Prof. Ringelmann provided a specification for how to draw them; where smoke level '0' is represented by white, levels '1' to '4' by 10 mm square grids drawn with 1 mm, 2.3 mm, 3.7 mm and 5.5 mm wide lines and level '5' by all black. [3] By 1897, printed cards for the Ringelmann smoke ...

  5. Relief printing - Wikipedia

    en.wikipedia.org/wiki/Relief_printing

    Relief printing is a family of printing methods where a printing block, plate or matrix, which has had ink applied to its non-recessed surface, is brought into contact with paper. The non-recessed surface will leave ink on the paper, whereas the recessed areas will not.

  6. Trap (printing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(printing)

    In printing, trap expresses the degree to which ink already printed on a substrate accepts another layer printed on top of it compared to how well the substrate (e.g., paper) accepts that ink. However, in the era of prepress software, the term came to refer to compensation for misregistration (when two layers of ink are not perfectly aligned ...

  7. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    All ISO paper sizes have the same aspect ratio, one to the square root of 2, meaning that a document designed for any given size can be enlarged or reduced to any other size and will fit perfectly. Given this ease of changing sizes, it is of course common to copy or print a given document on different sizes of paper, especially within a series ...

  8. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...

  9. Exercise book - Wikipedia

    en.wikipedia.org/wiki/Exercise_book

    1 for 10 pages; 2 for 20 pages; 4 for 40 pages; 6 for 60 pages; 8 for 80 pages; The third numeral stands for the ruling: 0 for blank exercise book; 1 for lined paperlines at 20 mm; 2 for lined paperlines at 16 mm; 3 for lined paperlines at 12 mm; 4 for lined paperlines at 8 mm; 5 for squared paper—squares are 5 x 5 mm