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A pipeline protected by wood lagging. Wood lagging is a method of banding wooden slats around pipelines to protect against impact, abrasion, and corrosion.Wooden lagging acts as a sheath, protecting the pipeline from damage, [1] and is especially useful in rocky terrain; steep inclines; around rivers or swampy areas; and other rough terrain. [2]
This gun was externally similar to the 3.7 cm Pak 36, using a modified version of the latter's carriage, but used the squeeze bore principle (in German called Gerlich after Hermann Gerlich, who developed the principle in the 1920s, reportedly for a hunting rifle) to boost its velocity, and hence armour-piercing ability. The bore had a diameter ...
M2 4.2-inch mortars in action on Utah Beach, 1944 A crew of an M2 mortar fires on North Korean positions in 1953 A 4.2-inch mortar in Korea, 1952.. The M2 4.2-inch mortar was a U.S. rifled 4.2-inch (107 mm) mortar used during the Second World War, the Korean War, and the Vietnam War.
The 5 cm KwK 38 L/42 (5 cm Kampfwagenkanone 38 L/42) was a German 50 mm 42 calibre cannon used as the main armament of variants of the German Panzer III medium tank during the Second World War.
The cone-bore principle was first patented in 1903 by a German inventor, Carl Puff. [ 3 ] [ 4 ] In the 1920s and 1930s, another German engineer, Hermann Gerlich, conducted experiments with coned-bore barrels that resulted in an experimental 7 mm anti-tank rifle with a muzzle velocity of 1,800 m/s.
The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada [1].It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters.