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Candies in aluminium foil packaging. Aluminium foil is widely sold into the consumer market, often in rolls of 500 mm (20 in) width and several metres in length. [14] Aluminium foil is also used for barbecuing delicate foods. [15] As with all metallic items, aluminium foil reacts to being placed in a microwave oven.
The thick Edison Discs recorded the sound vertically in the groove at a rate of 150 grooves-per-inch (GPI) rather than the typical laterally-cut groove of around 100 GPI, which gave 10-inch (250 mm) Edison discs a longer playing time (up to five minutes) than laterals and could only be played to their full advantage on Edison Diamond Disc ...
Acetate disc. 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. Lacquer-coated discs are used for the production of records.
Transcription discs are of two basic types: pressings and instantaneous discs. Pressings were created in the same way as ordinary records. A master recording was cut into a blank wax or acetate disc. [37] This was electroplated to produce a metal stamper from which a number of identical discs were pressed in shellac or vinyl in a record press.
DMM copper disc sitting on the turntable of a Neumann AM32 lacquer cutting lathe, built in the 1930s. Direct metal mastering (DMM) is an analog audio disc mastering technique jointly developed by two German companies, Telefunken-Decca and Georg Neumann GmbH, toward the end of the 20th century after having seen the same technology used by RCA Princeton Labs for its SelectaVision videodiscs in ...
Chemically, aluminium is a post-transition metal in the boron group; as is common for the group, aluminium forms compounds primarily in the +3 oxidation state. The aluminium cation Al 3+ is small and highly charged; as such, it has more polarizing power, and bonds formed by aluminium have a more covalent character.
Coil winding technology. In electrical engineering, coil winding is the manufacture of electromagnetic coils. Coils are used as components of circuits, and to provide the magnetic field of motors, transformers, and generators, and in the manufacture of loudspeakers and microphones. The shape and dimensions of a winding are designed to fulfill ...
Standard suspension disc insulator units are 25 centimetres (9.8 in) in diameter and 15 cm (6 in) long, can support a load of 80–120 kilonewtons (18,000–27,000 lb f), have a dry flashover voltage of about 72 kV, and are rated at an operating voltage of 10–12 kV. [15]
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