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  2. The Moving Picture Books - Wikipedia

    en.wikipedia.org/wiki/The_Moving_Picture_Books

    The Moving Picture Book Company and The Pictorial Color Book Company were early 20th-century American publishers known for producing interactive children's books. These publishers specialized in creating movable books , which featured mechanical illustrations that could move or change scenes with the pull of a tab.

  3. Moving iron speaker - Wikipedia

    en.wikipedia.org/wiki/Moving_iron_speaker

    The moving iron speaker was the earliest type of electric loudspeaker. They are still used today in some miniature speakers where small size and low cost are more important than sound quality . A moving iron speaker consists of a ferrous -metal diaphragm or reed, a permanent magnet and a coil of insulated wire .

  4. Category:Mechanical furniture - Wikipedia

    en.wikipedia.org/wiki/Category:Mechanical_furniture

    Furniture with moving mechanisms, usually for transforming it into a somewhat different piece of furniture Pages in category "Mechanical furniture" The following 7 pages are in this category, out of 7 total.

  5. Electrical characteristics of dynamic loudspeakers - Wikipedia

    en.wikipedia.org/wiki/Electrical_characteristics...

    The voice coil in moving coil drivers is suspended in a magnetic field provided by the loudspeaker magnet structure. As electric current flows through the voice coil (from an electronic amplifier), the magnetic field created by the coil reacts against the magnet's fixed field and moves the voice coil (and so the cone). Alternating current will ...

  6. Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker

    The driver is a linear motor connected to a diaphragm, which transmits the motor's movement to produce sound by moving air. An audio signal, typically originating from a microphone, recording, or radio broadcast, is electronically amplified to a power level sufficient to drive the motor, reproducing the sound corresponding to the original ...

  7. Compression driver - Wikipedia

    en.wikipedia.org/wiki/Compression_driver

    Today the majority of compression drivers, either by inheritance or design, are based on the guidelines outlined by Smith. The suppression technique of Smith has been recently extended [7] using a more accurate analytical acoustical model of the compression driver geometry. From this work improved phase plug design guidelines have been deduced ...

  8. Tape transport - Wikipedia

    en.wikipedia.org/wiki/Tape_transport

    Threaded tape of an open Compact Cassette in the tape drive. The capstan is a rotating spindle used to move recording tape through the mechanism of a tape recorder.The tape is threaded between the capstan and one or more rubber-covered wheels, called pinch rollers, which press against the capstan, thus providing friction necessary for the capstan to pull the tape.

  9. Geneva drive - Wikipedia

    en.wikipedia.org/wiki/Geneva_drive

    The Geneva drive or Geneva mechanism is a gear mechanism that translates a continuous rotation movement into intermittent rotary motion. The rotating drive wheel is usually equipped with a pin that reaches into a slot located in the other wheel (driven wheel) that advances it by one step at a time. The drive wheel also has an elevated circular ...

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