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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.
Thus, while a "full page magnifier" based on a fresnel lens can span some 625 cm 2 (96.9 sq in) , it typically achieves no more than 1.4x magnification (advertised as "2x" if measured by area instead of the scale factor); an aspheric segment hand magnifier can achieve a scale factor in excess of two (area factor in excess of four) but typically ...
Rendering this very page with Firefox, and magnifying its upper left corner with kmag. A screen magnifier is software that interfaces with a computer's graphical output to present enlarged screen content. By enlarging part (or all) of a screen, people with visual impairments can better see words and images.
Conquer even the smallest type with this handy gadget — complete with a light that allows you to read in bed without irking your spouse.
1714: Patent for an apparatus regarded as the first typewriter granted to Henry Mill (c. 1683–1771). [25] 18th century: The Valentine's card first popularised. [26] 1822: The mechanical pencil patented by Sampson Mordan (1790–1843) and John Isaac Hawkins (1772–1855). [27] 1831: Electromagnetic induction & Faraday's law of induction.
Margaret Cho is grateful for her sobriety. While attending the Out100 Event at Neuehouse in Hollywood, Calif. on Wednesday, Dec. 11, the comedian, 56, opened up about being sober for multiple ...
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