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The difference between those widths and the name of the bay size is because it is named after the size of floppy that would fit in those drives, a 5.25-inch-wide square. Half-height drive bays are 1 + 5 ⁄ 8 inches (41.3 mm) high by 5 + 3 ⁄ 4 inches (146.1 mm) wide, and are the standard housing for CD and DVD drives in modern computers.
IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators. In 1962, IBM introduced its model 1311 disk, which used six 14-inch (nominal size) platters in a removable pack and was roughly the size of a washing machine. This became a standard platter size and drive form ...
Floppy disk size is often referred to in inches, even in countries using metric and though the size is defined in metric. The ANSI specification of 3½-inch disks is entitled in part "90 mm (3.5-inch)" though 90 mm is closer to 3.54 inches. [ 49 ]
Unlike its French and Italian contemporaries of similar size the QF 5.25-inch gun was designed as dual-purpose equipment capable of engaging both aircraft and surface targets. Combining the secondary and heavy anti-aircraft armament allowed a significant weight savings for the King George V -class battleships, which were designed to meet the ...
The 38-caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun. United States naval gun terminology indicates the gun fired a projectile 5 inches (127 mm) in diameter, and the barrel was 38 calibers long. The increased barrel length provided greatly improved ...
In January 1939 a specification was issued for a gun no heavier than 5.5 tons to replace the 6 inch 26 cwt howitzers in use with most medium batteries. For the desired range of 16,000 yards (15 km) ballistic studies recommended making a new calibre of 5.5 inches.