The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33 1 ⁄ 3, 45, or 78 RPM), and appearance (round black discs).However, since the commercial adoption of the gramophone record (called a phonograph record in the U.S., where both cylinder records and disc records were invented), a wide variety of records have also been produced ...A disc harrow is a harrow whose cutting edges are a row of concave metal discs, which may be scalloped, set at an oblique angle. It is an agricultural implement that is used to till the soil where crops are to be planted. It is also used to chop up unwanted weeds or crop remainders.. It consists of many carbon steel discs, and sometimes longerlasting boron discs, which have many varying ...
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