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2. LP record - Wikipedia

   en.wikipedia.org/wiki/LP_record

   The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.

3. Large format - Wikipedia

   en.wikipedia.org/wiki/Large_format

   The most common large format is 4×5 inches (10.2x12.7 cm), which was the size used by cameras like the Graflex Speed Graphic and Crown Graphic, among others. Less common formats include quarter-plate (3.25x4.25 inches (8.3x10.8 cm)), 5×7 inches (12.7x17.8 cm), and 8×10 inches (20×25 cm); the size of many old 1920s Kodak cameras (various versions of Kodak 1, 2, and 3 and Master View cameras ...

4. Dubplate - Wikipedia

   en.wikipedia.org/wiki/Dubplate

   10" dubplates. A dubplate is an acetate disc usually of 10 inches diameter, traditionally used by studios to test recordings prior to mastering for the subsequent pressing of a vinyl record, but pioneered by reggae sound systems as a way to play exclusive music.

5. List of photographic film formats - Wikipedia

   en.wikipedia.org/wiki/List_of_photographic_film...

   3.716-inch spool: same picture size as 118 with longer spool 125 roll film 1905 ... 8 × 10: glass plates,sheet film 8 × 20: sheet film 11 × 14:

6. Acetate disc - Wikipedia

   en.wikipedia.org/wiki/Acetate_disc

   Acetates of 12", 10", 7" sizes. An acetate disc (also known as a lacquer, test acetate, dubplate, or transcription disc) is a type of phonograph record generally used from the 1930s to the late 1950s for recording and broadcast purposes. Despite their name, "acetate" discs do not contain any acetate.

7. Phonograph record - Wikipedia

   en.wikipedia.org/wiki/Phonograph_record

   Sizes of records in the United States and the UK are generally measured in inches, e.g. 7-inch records, which are generally 45 rpm records. LPs were 10-inch records at first, but soon the 12-inch size became by far the most common. Generally, 78s were 10-inch, but 12-inch and 7-inch and even smaller were made—the so-called "little wonders". [82]