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  2. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A USAF 1951 resolution chart in PDF format is provided by Yoshihiko Takinami. This chart should be printed such that the side of the square of the 1st element of the group -2 should be 10 mm long. USAF 1951 Resolution Target Further explanations and examples; Koren 2003: Norman Koren's updated resolution chart better suited for computer analysis

  3. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    A foot-long sheet with the common width of Letter and (Government) Legal, i.e. 8 + 1 ⁄ 2 in × 12 in (215 mm × 305 mm), would have an aspect ratio very close to the square root of two as used by international paper sizes and would actually almost exactly match ISO RA4 (215 mm × 305 mm).

  4. ISO 216 - Wikipedia

    en.wikipedia.org/wiki/ISO_216

    The most used of this series is the size A4, which is 210 mm × 297 mm (8.27 in × 11.7 in) and thus almost exactly 1 ⁄ 16 square metre (0.0625 m 2; 96.8752 sq in) in area. For comparison, the letter paper size commonly used in North America ( 8 + 1 ⁄ 2 in × 11 in; 216 mm × 279 mm) is about 6 mm ( 0.24 in ) wider and 18 mm ( 0.71 in ...

  5. Half-value layer - Wikipedia

    en.wikipedia.org/wiki/Half-value_layer

    A material's half-value layer (HVL), or half-value thickness, is the thickness of the material at which the intensity of radiation entering it is reduced by one half. [1] HVL can also be expressed in terms of air kerma rate (AKR), rather than intensity: the half-value layer is the thickness of specified material that, "attenuates the beam of radiation to an extent such that the AKR is reduced ...

  6. ISO/IEC 7810 - Wikipedia

    en.wikipedia.org/wiki/ISO/IEC_7810

    The ID-1 format specifies a size of 85.60 by 53.98 millimetres (3 + 3 ⁄ 8 in × 2 + 1 ⁄ 8 in) and rounded corners with a radius of 2.88–3.48 mm (about 1 ⁄ 8 in). This format is also referred to as CR-80 and, for travel documents, TD1. It is commonly used for payment cards (ATM cards, credit cards, debit cards, etc.).

  7. Mill scale - Wikipedia

    en.wikipedia.org/wiki/Mill_scale

    Mill scale is a complex oxide that contains around 70% iron with traces of nonferrous metals and alkaline compounds. Reduced iron powder may be obtained by conversion of mill scale into a single highest oxide i.e. hematite (Fe 2 O 3) followed by reduction with hydrogen.

  8. 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 ...

  9. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    The smallest dimension the human eye can resolve is around 0.02 to 0.04 mm, approximately the width of a thin human hair. [6] A sheet of paper is typically between 0.07 mm and 0.18 mm thick, with ordinary printer paper or copy paper approximately 0.1 mm thick. [7]