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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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|BL 13.5 inch Mk V gun|
The after 13.5-inch (343 mm) Mark V guns of the battleship HMS Emperor of India
|Place of origin||United Kingdom|
|In service||1912 - 1940s (as railway gun)|
|Used by||United Kingdom|
|Wars||World War I
World War II
|Barrel length||Bore 50 ft 6 in (15.392 m) (45 cal)|
|Shell||H: 1,400 lb (635.03 kg)
L: 1,250 lb (566.99 kg) HE, AP
|Calibre||13.5-inch (342.9 mm)|
|Elevation||Naval: 0° - 20°
Railway: 0° - 40°
|Muzzle velocity||H: 2,491 ft/s (759 m/s)
L: 2,582 ft/s (787 m/s)
|Maximum range||H: 23,740 yards (21,710 m) at 20°
L: 23,820 yards (21,780 m) at 20°
H: 40,600 yards (37,120 m) at 40° (WWII railway gun, with Super Charge)
The BL 13.5 inch Mk V gun was a British heavy naval gun, introduced in 1912 as the main armament for the new super-dreadnought battleships of the Orion class. The calibre was 13.5 inches (343 mm) and the barrels were 45 calibres long i.e. 607.5 inches (15.43 m). The guns were greatly superior to the earlier 13.5-inch (30-calibre) Mk I to Mk IV guns used on the Admiral, Trafalgar and Royal Sovereign classes completed between 1888 and 1896.
The gun weighed approximately 168,000 lb (76 tonnes) (excluding the breech), and in its original form fired a 1,250 lb (567 kg) armour-piercing capped (APC) or high-explosive (HE) round a distance of 23,800 yards (21,800 m) at a 20-degree elevation.
Due to the excellent characteristics of the gun, it was decided to increase the weight of shell to 1,400 lb (635 kg), with an increased firing charge to achieve about the same range. The gun firing the lighter shell was designated Mark V(L) (for "light") by the Royal Navy, and the 1,400 lb version Mark V(H) (for "heavy"). A very similar 1,400 lb gun, designed for the Turkish battleship Reshadieh, received the designation Mark VI when the ship was requisitioned by the British government after the outbreak of the First World War, eventually being commissioned as HMS Erin.
Three BL 13.5 inch /45 Mark V guns, named Gladiator, Piece Maker [sic] and Scene Shifter, were mounted on railway chassis during World War II for use as railway guns. Scene Shifter re-used a railway truck which had carried a BL 14 inch Railway Gun in the First World War. In 1940 these guns were issued to the Royal Marine Siege Regiment at Dover in Kent to bombard German batteries and shipping in the Calais area. They could be stored in railway tunnels when not in use to protect them from attack.
British warships with the BL 13.5 inch /45 gun;
|Wikimedia Commons has media related to: BL 13.5 inch Mk V naval gun|