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2. 4-inch/40-caliber gun - Wikipedia

   en.wikipedia.org/wiki/4-inch/40-caliber_gun

   Gun No. 4, the first Mark 2, was completed in September 1890. [2] The Mark 3 Mod 0, M1890, would be the production version of the 4-inch/40 caliber bag gun with a total of 69 built in five Mods. The Mod 1 added a screw-box liner and chamber liner allowing it to use fixed ammunition along with only one hoop and a locking hoop and was hooped to ...

3. List of naval guns by caliber - Wikipedia

   en.wikipedia.org/wiki/List_of_naval_guns_by_caliber

   102 mm (4.0 in) BL 4 inch Mk VIII & XI 40-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk IX naval gun 45-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) QF 4 inch Mk I - III 40-caliber United Kingdom: 1895 - World War I 102 mm (4.0 in) QF 4 inch Mk IV, XII, XXII 40-caliber United Kingdom

4. Nominal Pipe Size - Wikipedia

   en.wikipedia.org/wiki/Nominal_Pipe_Size

   Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

5. BL 4-inch Mk I–VI naval gun - Wikipedia

   en.wikipedia.org/wiki/BL_4-inch_Mk_I–VI_naval_gun

   A small number of these guns were converted to QF to use the same cartridges as the QF 4-inch gun. They were designated Mk I/IV, I/VI etc. depending on which Mark of BL 4-inch had been converted. All had a bore of 27.85 calibres after conversion, with a muzzle velocity of 2,177 ft/second. [2]

6. QF 4-inch naval gun Mk XIX - Wikipedia

   en.wikipedia.org/wiki/QF_4-inch_naval_gun_Mk_XIX

   8,870 metres (9,700 yd) at +40° [2] The QF 4-inch Mk XIX gun [ note 1 ] was a British low-velocity 4-inch 40- calibre naval gun used to arm small warships such as Bathurst and Castle-class corvette and some River-class frigate in World War II , mainly against submarines.

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   This popular vitamin C serum is on sale for just $10: '60 is the new 40' AOL. Glamorous gold jewelry staples you can wear on repeat — all under $15. AOL.