Авторы и издатель не идентифицированы. Документ в формате pdf. – 15
c.
The 8"/55 caliber gun (spoken "eight-inch-fifty-five-caliber")
formed the main battery of United States Navy heavy cruisers and
two early aircraft carriers (Mark 9, Mark 12, Mark 14, Mark 15,
Mark 16). United States naval gun terminology indicates the gun
barrel had an inteal diameter of 8 inches (203 mm), and the
barrel was 55 calibers long (barrel length is 8 inch × 55 = 440
inches or 11 meters).