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  2. List of largest optical refracting telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.

  3. 6.5mm Creedmoor - Wikipedia

    en.wikipedia.org/wiki/6.5mm_Creedmoor

    The 6.5mm Creedmoor was designed for target shooting at longer ranges, and as such, couples a sensible ratio of case volume (3.40 ml) to bore area (34.66 mm 2 /0.3466 cm 2) with ample space for loading long slender projectiles providing good aerodynamic efficiency and external ballistic performance for the projectile diameter. [4]

  4. South African units of measurement - Wikipedia

    en.wikipedia.org/wiki/South_African_units_of...

    The Rhynland rood (Rijnlandse roede) was a standard Dutch measurement.It was changed in 1859 to the "Cape Foot" due to a drift in standards. 1 Rhynland foot (Rijnlandse voet) = 12 Rhynland inches (Rijnlandse duim) = 1.030 English feet.

  5. 4K resolution - Wikipedia

    en.wikipedia.org/wiki/4K_resolution

    3840 × 1600 (2.40:1 or 12:5); a number of computer monitors with this resolution have been produced, the first being the 37.5-inch (95 cm) LG 38UC99-W released in 2016. This resolution is equivalent to WQXGA (2560 × 1600) extended in width by 50%, or 3840 × 2160 reduced in height by ≈26%. [ 140 ]

  6. Metre - Wikipedia

    en.wikipedia.org/wiki/Metre

    "≈" means "is approximately equal to"; "=" means "is exactly equal to". One metre is exactly equivalent to ⁠ 5 000 / 127 ⁠ inches and to ⁠ 1 250 / 1 143 ⁠ yards. A simple mnemonic to assist with conversion is "three 3s": 1 metre is nearly equivalent to 3 feet 3 + 3 ⁄ 8 inches. This gives an overestimate of 0.125 mm.

  7. Rebar - Wikipedia

    en.wikipedia.org/wiki/Rebar

    The diameter of the equivalent large format round shape is rounded to the nearest 1 ⁄ 8 inch to provide the bar size. For example, #9 bar has a cross section of 1.00 square inch (6.5 cm 2), and therefore a diameter of 1.128 inches (28.7 mm). #10, #11, #14, and #18 sizes correspond to 1 1 ⁄ 8 inch, 1 1 ⁄ 4, 1 1 ⁄ 2, and 2-inch square ...

  8. 7 mm caliber - Wikipedia

    en.wikipedia.org/wiki/7_mm_caliber

    Name Bullet Case length Rim Base Shoulder Neck OAL .270 British: 7.04 mm (0.277 in) 46 mm (1.8 in) 11.3 mm (0.44 in) 11.3 mm (0.44 in) - - 62.3 (2.45)

  9. 8 mm caliber - Wikipedia

    en.wikipedia.org/wiki/8_mm_caliber

    Name Bullet Length Rim Base Neck OAL .32 S&W (.32 S&W Short): 7.9 (.312) 15 (.61) 9.5 (.375) 8.5 (.335) 8.5 (.334) 23 (.92) .32 S&W Long: 7.9 (.312) 23.37 (.920) 9.53 ...