Note 37 — Chapter XI · THE NEW SUBMARINE CHASERS
Reading edition
The caliber of a gun is the gage, or diameter of the bore of its barrel. Thus a gun of 3-inch caliber means that the bore is 3 inches in diameter; a gun that has a caliber of 45 centimeters means that its bore is 45 centimeters across. A centimeter is 1/100 of a meter and a meter is 39.37 inches.