name means that it had a bore diameter of 1.1 in (28 mm) and barrel caliber of 75 (1.1inches × 75 = 82.5 in (2.1 m)). The gun was designed to replace the
millimetres 1 cm – 0.39 inches1 cm – edge of a square of area 1 cm2 1 cm – edge of a cube of volume 1 mL 1 cm – length of a coffee bean 1 cm – approximate
values for the international yard, avoirdupois pound and derived units (e.g. inch, mile and ounce) are adopted after agreement between the US, the United Kingdom