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A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".
Architectural drawing, Germany, 1902 Architectural drawing, Canada, 1936. The blueprint process is based on a photosensitive ferric compound. The best known is a process using ammonium ferric citrate and potassium ferricyanide. [6] [7] The paper is impregnated with a solution of ammonium ferric citrate and dried. When the paper is illuminated ...
Paper size refers to standardized dimensions for sheets of paper used globally in stationery, printing, and technical drawing. Most countries adhere to the ISO 216 standard, which includes the widely recognized A series (including A4 paper ), defined by a consistent aspect ratio of √2.
Smaller and mid-size blueprint machines were often outfitted with neutralizers which absorbed some of the ammonia for some time. If the lines are too light, it is also possible to run the blue line through the developing chamber once more, which often increases the contrast of the lines relative to the base media.
An adjunct to the ISO paper sizes, particularly the A series, are the technical drawing line widths specified in ISO 128. For example, line type A ("Continuous - thick", used for "visible outlines") has a standard thickness of 0.7 mm on an A0-sized sheet, 0.5 mm on an A1 sheet, and 0.35 mm on A2, A3, or A4.
The sizes of the RA series are also slightly larger than corresponding inch-based US sizes specified in ANSI/ASME Y14.1, e.g. RA4 is roughly equivalent to 8 + 1 ⁄ 2 in × 12 in (220 mm × 300 mm) and ANSI A (alias US Letter) is defined as 8 + 1 ⁄ 2 in × 11 in (220 mm × 280 mm).