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  2. Dome magnifier - Wikipedia

    en.wikipedia.org/wiki/Dome_magnifier

    A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses : the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement.

  3. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...

  4. Azimuth compass - Wikipedia

    en.wikipedia.org/wiki/Azimuth_compass

    Yet another design has a magnifying glass on one vane that focuses the rays of the Sun on the opposite vane. [7] Meridional azimuth compasses included a universal equatorial sundial. By setting the date and latitude, the true north and the magnetic variation could be read from the instrument without the need for calculation. [8]

  5. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    The postage stamp appears larger with the use of a magnifying glass. Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of something.

  6. Coddington magnifier - Wikipedia

    en.wikipedia.org/wiki/Coddington_magnifier

    A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...

  7. Grandma's Reading Glass - Wikipedia

    en.wikipedia.org/wiki/Grandma's_Reading_Glass

    Grandma's Reading Glass is a 1900 British silent trick film, directed by George Albert Smith, featuring a young boy who borrows a huge magnifying glass to focus on various objects. The film was shot to demonstrate the new technique of close-up .

  8. Cumberland and Westmorland Convalescent Institution railway ...

    en.wikipedia.org/wiki/Cumberland_and_Westmorland...

    The station does not appear on standard railway maps, [7] but it can be discerned with a magnifying glass on at least two published maps [8] and clearest of all on the 1914 25" OS map. [9] The station's sole purpose was to serve the convalescent home of the same name.

  9. Microfilm reader - Wikipedia

    en.wikipedia.org/wiki/Microfilm_reader

    One of the earliest readers of microfilm was the Coddington Magnifier. Developed by Sir David Brewster, this magnifier was a "simple plano-convex lens of such thickness that the focus of its spherical curvature coincides with the flat surface of the lens. [2] On June 21, 1859, the first patent for a microfilm was issued to Rene Dargon in France.

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