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2. Spinner's weasel - Wikipedia

   en.wikipedia.org/wiki/Spinner's_weasel

   Spinner's weasel (left) and spinning wheel (right) Spinner's weasel or clock reel is a mechanical yarn-measuring device consisting of a spoked wheel with gears attached to a pointer on a marked face (which resembles a clock) and an internal mechanism that makes a "pop" sound after the desired length of yarn is measured (usually a skein). The ...

3. Reel - Wikipedia

   en.wikipedia.org/wiki/Reel

   A standard Hollywood movie averages about five 2,000-foot reels in length. The "reel" was established as a standard measurement because of considerations in printing motion picture film at a film laboratory, for shipping (especially the film case sizes) and for the size of the physical film magazine attached to the motion picture projector.

4. Reel-to-reel audio tape recording - Wikipedia

   en.wikipedia.org/wiki/Reel-to-reel_audio_tape...

   A reel-to-reel tape recorder (Sony TC-630), typical of a 1970s audiophile device. Reel-to-reel audio tape recording, also called open-reel recording, is magnetic tape audio recording in which the recording tape is spooled between reels. To prepare for use, the supply reel (or feed reel) containing the

5. Audio tape specifications - Wikipedia

   en.wikipedia.org/wiki/Audio_tape_specifications

   The first commonly available increase in tape length resulted from a reduction in backing thickness from 1.5 to 1.0 mil (38 to 25 μm) resulting in a total thickness reduction from 42 to 35 μm (1.7 to 1.4 mils), which allowed 3,600 ft (1,100 m), 1,800 ft (550 m), and 900 ft (270 m) tapes to fit on ten-and-a-half-, seven-, and five-inch reels respectively.

6. IMAX - Wikipedia

   en.wikipedia.org/wiki/IMAX

   IMAX film is shipped to theaters in several small reels that are spliced into one continuous length that is then wound into a platter, a process that may take hours to complete. Films may be several kilometers in length: Avatar , which was 2:45 hours in duration, was close to 16 km (9.9 mi) long.

7. Pixel aspect ratio - Wikipedia

   en.wikipedia.org/wiki/Pixel_aspect_ratio

   Storage aspect ratio is the ratio of the image width to height in pixels, and can be easily calculated from the video file. Display aspect ratio is the ratio of image width to height (in a unit of length such as centimeters or inches) when displayed on screen, and is calculated from the combination of pixel aspect ratio and storage aspect ratio.

8. 9-track tape - Wikipedia

   en.wikipedia.org/wiki/9-track_tape

   9-track tape drive used with DEC minicomputers Inside a 9-track tape drive. The vacuum columns are the two gray rectangles on the left. A typical 9-track unit consists of a tape transport—essentially all the mechanics that moves tape from reel to reel past the read/write and erase heads—and supporting control and data read/write electronics.

9. Video tape recorder - Wikipedia

   en.wikipedia.org/wiki/Video_tape_recorder

   AMPEX quadruplex VR-1000A, the first commercially released video tape recorder in the late 1950s; quadruplex open-reel tape is 2 inches wide The first portable VTR, the suitcase-sized 1967 AMPEX quadruplex VR-3000 1976 Hitachi portable VTR, for Sony 1" type C; the source and take-up reels are stacked for compactness. However, only one reel is ...