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A plastic 45 rpm adapter that inserts into the large spindle hole of a 45 rpm record. A 45 rpm adapter (also known as a 45 rpm record insert, 45 rpm spindle adapter, spider, or 7-inch adapter in reference the usual size of a 45 rpm record) is a small plastic or metal insert that goes in the middle of a 45-rpm record so it can be played on the standard size spindle of a turntable.
The technique had existed for years, so by using the methods listed above Justin Kerr succeeded in making a camera that captured the first Maya pottery vessel using rollout photography. The rollout technique was perfected through the use of a record turntable, clamps, and various pieces of wood and belts.
The RCA and GE units kept the records stacked on the turntable and slid the top record to the side after playing it. A separate sequence, the "slide-automatic sequence," was made for these changers, with sides coupled 1&5, 2&6, 3&7 and 4&8. Some record changers could play both sides of each record.
Linn presented an important challenge to that by claiming that the source (i.e. the turntable) was the most important part of the system. [1] Ivor Tiefenbrun has talked about how Sondek derives from the term “sound deck” to emphasise the revolutionary concept that the turntable, the “deck”, is responsible for the sound quality. [9]
The first commercially successful type of electrical phonograph pickup was introduced in 1925. Although electromagnetic, its resemblance to later magnetic cartridges is remote: it employed a bulky horseshoe magnet and used the same single-use steel needles which had been standard since the first mechanical transfer disc record players appeared in the 1890s.
It supplied turntables and autochangers to many of the world’s record player manufacturers, eventually gaining 87% of the market. The company also manufactured their own brand of player, the Monarch automatic record changer, which could select and play 7", 10" and 12" records at 16, 33 1 ⁄ 3 , 45 or 78 rpm, automatically intermixing ...
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