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On pedestal and other mounts lacking integral hoists, 12 to 15 rounds per minute was the rate of fire. [7] Useful life expectancy was 4600 effective full charges (EFC) per barrel. [8] The 5"/38 cal gun was mounted on a very large number of US Navy ships in the World War II era.
In medieval times, warships had a single deck, with raised structures at each end: the "forecastle" in the front, and the "aftercastle" in the rear.Following the introduction of cannon, the aftercastle was gradually replaced with a simpler structure consisting of the halfdeck above the main deck, extending forwards from the stern to the mainmast; and above that the quarterdeck, extending about ...
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The size of the seatpost is dependent upon the internal dimensions of the seat tube of the bicycle frame. They come in various diameters, lengths and offsets. Offset is the distance between the centerline of the seatpost tube, and the centerline of the clamp area. Shims are often available to adapt a too-small seatpost to a too-large seat tube.
Toilet seat risers, toilet risers, or raised toilet seats are assistive technology devices to improve the accessibility of toilets to older people or those with disabilities. They can aid in transfer from wheelchairs, [ 1 ] and may help prevent falls.
A long narrow centreboard produces less drag than a short, wide one for a given amount of lift, resulting in a faster boat that can point closer into the wind. A fore and aft, pivoting centreboard can also be used to move the centre of lateral resistance aft to match a change in sail plan, such as furling or dropping the jib.