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  2. Guide number - Wikipedia

    en.wikipedia.org/wiki/Guide_number

    Thus, a subject 11 meters or 36 feet away will be correctly illuminated (GN 44 (m) ÷ f /4 = 11 m, and GN 144 (ft) ÷ f /4 = 36 ft). For the same guide number and an aperture of f /8, the light source must be 5.5 meters or 18 feet from the subject.

  3. Engineering drawing abbreviations and symbols - Wikipedia

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

    CAD: 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.

  4. Gn15 - Wikipedia

    en.wikipedia.org/wiki/Gn15

    Alongside Gn15 other modeling scales have developed to cover both the modelling of minimum gauge lines in scales smaller than G, and 'miniature' lines (less than 15 in / 381 mm) in G scale. O9 or On15 is the use of N gauge track in 7mm scale to represent a 'minimum gauge' line.

  5. G scale - Wikipedia

    en.wikipedia.org/wiki/G_scale

    G gauge track has a spacing of 45 mm between the railheads (tracks) (c.f. 44.45 mm for 1 gauge, but that does not determine the scale to which the models are built because, to maintain a constant track width when real-life counterparts have a variety of railroad gauges, the scale has to vary.

  6. Rail transport modelling scales - Wikipedia

    en.wikipedia.org/.../Rail_transport_modelling_scales

    This scale is today the most popular modelling scale in the UK, although it once had some following in the US (on 19 mm / 0.748 in gauge track) before World War II. 00 or "Double-Oh", together with EM gauge and P4 standards are all to 4 mm scale as the scale is the same, but the track standards are incompatible. 00 uses the same track as HO (16 ...

  7. Scale (ratio) - Wikipedia

    en.wikipedia.org/wiki/Scale_(ratio)

    Examples include a 3-dimensional scale model of a building or the scale drawings of the elevations or plans of a building. [1] In such cases the scale is dimensionless and exact throughout the model or drawing. The scale can be expressed in four ways: in words (a lexical scale), as a ratio, as a fraction and as a graphical (bar) scale.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Orders of magnitude (force) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(force)

    Magnitude Value Item 1 N 1.4 N The weight of a smartphone [13] [14]: 2.5 N Typical thrust of a Dual-Stage 4-Grid ion thruster.: 9.8 N One kilogram-force, nominal weight of a 1 kg (2.2 lb) object at sea level on Earth [15]