In the early 1900s, the acoustic phonographs varied in speeds from 74 to 82 rpm. If the speed of the disc was slower, such as 40 rpm, then the record would have played longer but the sound would have been very bad. If the disc had a speed of 100 rpm, then the playing time would be very short, yet the sound would have been very good. This was so because the fidelity and playing time had to even out, so the sounds that were heard would be good in quality and not very short in playing time either. The original, standard speed for the disc is 78 rpm. The disc may have three speeds at which it rotates: 33.3, 45, or 78 revolutions per minute (rpm). Edison produced the phonograph to be used as a dictating device, but soon it turned into one of the most popular and important machines that were used for sound reproduction in the 1900s. The tonearm, a pivoted rod, has a needle, or a stylus, at the end that moves from side to side and vibrates which in return transforms into electrical signals that are then amplified to reproduce the sound through loudspeakers. The turntable rotates by an electric motor and this is where the record, or disc, is placed. An amplifier and a loudspeaker are included in some, but not all, phonographs. The phonograph is made up of a turntable and a tonearm. A phonograph that uses discs is called a gramophone and was invented by Emile Berliner in 1887. The phonograph is used to replay sounds that are recorded on a disc or cylinder. In 1877, Thomas A Edison created one of the first recording musical devices, the phonograph, which is also known as the record player. "I installed the turntable wheel and powered up the motor: it worked in the 78, 45 and 33 rpm positions." Installing 3-Speed Motor in 78-RPM Phonograph. With a 46:1 gear, this produced a speed of 78.26 rpm, which became the standard." "From 1900 to 1925 it hovered between 74 and 82 revolutions per minute, then became stabilized at 78 rpm with the introduction of electrically powered turntables. Fabulous Phonograph: From Edison to Stereo. "Because it is designed to work with records not been previously encoded, the Burwen System is of particular interest to owners of old 78 rpm records." "is made to rotate on the turntable at constant speed, usually 33.3, 45, or 78 revolutions per minute (rpm)." "tangential acceleration of a bug on the rim of a 10.0 inch diameter disk if the disk moves from rest to an angular speed of 78 rpm"įunk and Wagnalls New Encyclopedia.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |