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  2. Scale length (string instruments) - Wikipedia

    en.wikipedia.org/wiki/Scale_length_(string...

    Concert grand pianos range in scale from about 7 feet 6 inches to 9 feet 0 inches (229 to 274 cm) or occasionally more. Notable concert grands include: The Steinway Model D, at 8 feet 11 + 3 ⁄ 4 inches (273.7 cm). The Imperial Bösendorfer, at 9 feet 6 inches (290 cm) with 97 keys. The Fazioli F308 at 10 feet 2 inches (310 cm).

  3. English units - Wikipedia

    en.wikipedia.org/wiki/English_units

    Width of the hand and outstretched thumb, 6 + 1 ⁄ 2 inches before 12th century, 6 thereafter [14] Link: 201.2 mm: 7.92 inches or one 100th of a chain. [15] (A modern Indian surveyor's chain has 200 mm links.) Span: 228.6 mm: Width of the outstretched hand, from the tip of the thumb to the tip of the little finger, 3 palms = 9 inches. Foot ...

  4. Display resolution standards - Wikipedia

    en.wikipedia.org/wiki/Display_resolution_standards

    Keeping the pixel density of previous models, the iPhone X and 11 Pro introduced a 2436 × 1125 resolution for 15 cm or 5.8 inch screens, while the iPhone XS Max and 11 Pro Max introduced a 2688 × 1242 resolution for 17 cm or 6.5 inch screens (with a notch) all at an aspect ratio of roughly 13∶6 or, for marketing, 19.5∶9.

  5. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    The posts are each 0.625 inches (15.88 mm) wide, and are separated by a gap of 17.75 inches (450.85 mm), giving an overall rack width of 19 inches (482.60 mm). The posts have holes in them at regular intervals, with both posts matching, so that each hole is part of a horizontal pair with a center-to-center distance of 18.312 inches (465.12 mm).

  6. Hard disk drive - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive

    The 1301 consisted of one (for Model 1) or two (for model 2) modules, each containing 25 platters, each platter about 1 ⁄ 8-inch (3.2 mm) thick and 24 inches (610 mm) in diameter. [32] While the earlier IBM disk drives used only two read/write heads per arm, the 1301 used an array of 48 [ l ] heads (comb), each array moving horizontally as a ...

  7. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    −0.07 GeV cm −3) [20] The Milky Way [ c ] is the galaxy that includes the Solar System , with the name describing the galaxy's appearance from Earth : a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye .

  8. Sea level rise - Wikipedia

    en.wikipedia.org/wiki/Sea_level_rise

    If there are very deep cuts in emissions, sea level rise would slow between 2050 and 2100. It could then reach by 2100 between 30 cm (1 ft) and 1.0 m (3 + 1 ⁄ 3 ft) from now and approximately 60 cm (2 ft) to 130 cm (4 + 1 ⁄ 2 ft) from the 19th century. With high emissions it would instead accelerate further, and could rise by 50cm (1.6 ft ...

  9. Thickness-to-chord ratio - Wikipedia

    en.wikipedia.org/wiki/Thickness-to-chord_ratio

    a=chord, b=thickness, thickness-to-chord ratio = b/a The F-104 wing has a very low thickness-to-chord ratio of 3.36%. In aeronautics, the thickness-to-chord ratio, sometimes simply chord ratio or thickness ratio, compares the maximum vertical thickness of a wing to its chord.