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  2. Schmidt camera - Wikipedia

    en.wikipedia.org/wiki/Schmidt_camera

    In the 1930s, Schmidt noted that the corrector plate could be replaced with a simple aperture at the mirror's center of curvature for a slow (numerically high f-ratio) camera. Such a design was used to construct a working 1/8-scale model of the Palomar Schmidt, with a 5° field. [19] The retronym "lensless Schmidt" has been given to this ...

  3. Beltweigher - Wikipedia

    en.wikipedia.org/wiki/Beltweigher

    A beltweigher or belt weigher, more commonly known as a belt scale, is a piece of industrial control equipment used to measure the mass and flow rate of bulk material traveling over a conveyor belt. [1] Invented by Herbert Merrick in the early 1900's, belt weighers are commonly used in plants and heavy industries, such as mining. [2]

  4. Check weigher - Wikipedia

    en.wikipedia.org/wiki/Check_weigher

    These checkweighers are known also as belt weighers, in-motion scales, conveyor scales, dynamic scales, and in-line scales. In filler applications, they are known as check scales. Typically, there are three belts or chain beds: An infeed belt that may change the speed of the package and to bring it up or down to a speed required for weighing.

  5. Schmidt–Cassegrain telescope - Wikipedia

    en.wikipedia.org/wiki/Schmidt–Cassegrain_telescope

    People demonstrating a Schmidt–Cassegrain telescope at a sidewalk gathering. The Schmidt–Cassegrain design is very popular with consumer telescope manufacturers because it combines easy-to-manufacture spherical optical surfaces to create an instrument with the long focal length of a refracting telescope with the lower cost per aperture of a reflecting telescope.

  6. Length scale - Wikipedia

    en.wikipedia.org/wiki/Length_scale

    The atomic length scale is ℓ a ~ 10 −10 m and is given by the size of hydrogen atom (i.e., the Bohr radius, approximately 53 pm).; The length scale for the strong interactions (or the one derived from QCD through dimensional transmutation) is around ℓ s ~ 10 −15 m, and the "radii" of strongly interacting particles (such as the proton) are roughly comparable.

  7. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    The rather uncommon [citation needed] 40 mm figure scale wargames figures fit approximately into this scale. 1:45: 6.773 mm This is the scale which MOROP has defined for O scale, because it is half the size of the 1:22.5 Scale G-gauge model railways made by German manufacturers. [citation needed] 1:43.5: 7.02 mm: Model railways (0)

  8. Scale length - Wikipedia

    en.wikipedia.org/wiki/Scale_length

    Scale length may refer to: Length scale (or "scale length"), a significant concept in physics used to define the order of magnitude of a system; Scale height (or "scale length"), a specific parameter in physics denoting the distance over which a quantity decreases by a factor of e; Scale length (string instruments), a measurement of the length ...

  9. Rail transport modelling scales - Wikipedia

    en.wikipedia.org/.../Rail_transport_modelling_scales

    O-scale models of 3 ft 6 in narrow-gauge prototypes running on 24 mm gauge track. Virtually unknown outside Japan and Taiwan On2: 1:48: 12.7 mm O-scale models of 2 ft narrow-gauge prototypes running on 1 ⁄ 2 in (12.7 mm) gauge track. On30 gauge: 1:48: 16.5 mm Narrow gauge O-scale models running on HO gauge track.