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As such, the 21-inch torpedoes were designated as 53 cm torpedoes. Japanese torpedoes have usually conformed to the 45 cm (17.7-inch or 18-inch), the 53 cm (21-inch), and the 61 cm (24-inch) calibers. [2] The Japanese type designation scheme has mostly used three different approaches.
Sizes are often expressed as a fraction of an inch, with a one in the numerator, and a decimal number in the denominator. For example, 1/2.5 converts to 2/5 as a simple fraction, or 0.4 as a decimal number. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor.
Chicago [a] is the most populous city in the U.S. state of Illinois and in the Midwestern United States.With a population of 2,746,388, as of the 2020 census, [9] it is the third-most populous city in the United States after New York City and Los Angeles.
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 February 2025. 2013 domestic terrorist attack in Boston, Massachusetts, U.S. "Boston attack" redirects here. For the incident in 1770, see Boston Massacre. "Boston bomber" redirects here. For the Douglas Boston bomber aircraft, see Douglas A-20 Havoc. Boston Marathon bombing Moments after the first ...