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The LSST pier is unusually large (16 m diameter), robust (1.25-meter-thick walls) and mounted directly to virgin bedrock, [109] where care was taken during site excavation to avoid using explosives that would crack it. [106]: 11–12 Other unusual design features are linear motors on the main axes and a recessed floor on the mount. This allows ...
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
The original Fort Dade gun described on the base was placed in Plant Park in November 1927 but was donated to a steel scrap drive during World War II. Following the war, an eight-inch (203 mm) gun of similar vintage (both were M1888 weapons) was obtained from Fort Morgan, Alabama and installed on the 1927 memorial's vacant plinth. The new gun ...
Siege and garrison artillery were larger versions of field artillery, mounted on heavyweight carriages which allowed them very limited mobility: the M1839 24-pounder smoothbore was the largest one which could still be moved by road.
The lance is typically constructed from 1.25-or-1.5-inch-thick (3.2 or 3.8 cm) wood, depending on the progression of a joust. Instead of the sharp tip of war lances, a jousting lance has a blunt tip with a wider impact surface, putting more force into the impact on the shield rather than impaling the opponent.
The secondary armament of the Lion class consisted of sixteen BL 4-inch Mark VII guns, most of which were mounted in casemates in single mounts. [12] The guns had maximum elevations of +15°, which gave them a range of 11,400 yd (10,424 m). They fired 31-pound (14.1 kg) projectiles at muzzle velocities of 2,821 ft/s (860 m/s). [13]