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Phonograph record
Optical disc - Wikipedia ... Optical disc
The most common diameter sizes for gramophone records are 12-inch, 10-inch, and 7-inch (300 mm, 250 mm, and 180 mm). [1] Early American shellac records were all 7-inch until 1901, when 10-inch records were introduced. 12-inch records joined them in 1903. [2] By 1910, other sizes were retired and nearly all discs were either 10-inch or 12-inch ...
The lunette takes the form of a flat, circular container, composed of a ring of metal (usually lined with gold) holding two glass or crystal discs, which create a round, flat, glass-enclosed space for the Eucharistic Host. This is used for exposition and Benediction services. [2] The lunette, containing the consecrated Host, is placed in the ...
Computer rendering of Euler's Disk on a slightly concave base. Euler's Disk, invented between 1987 and 1990 by Joseph Bendik, [1] is a trademarked scientific educational toy. [2] It is used to illustrate and study the dynamic system of a spinning and rolling disk on a flat or curved surface. It has been the subject of several scientific papers.
Hard disk drive platter
Optical flat - Wikipedia ... Optical flat
Crown glass (window)
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