33°50′08″S 151°15′29″E / 33.835471°S 151.258049°E / -33.835471; 151.258049
6-437: The Lower Georges Heights Commanding Position is located in the urban locality of Georges Heights in the suburb of Mosman , on the shores of Port Jackson , Sydney , New South Wales , Australia . The Lower Georges Heights Commanding Position was constructed and designed to stop enemy ships from entering into Sydney Harbour, and worked in conjunction with several others forts located within close proximity. The fortification
12-463: The fortifications were upgraded to allow for the installation of two BL 6 inch Mark 7 guns that were “breech loading” which meant that the explosive charge and projectile were to be loaded into the rear of the cannon. They could fire a 100-pound (45.4 kg) shell a long way out to sea; up to 14,000 yards (12,900 metres). The underground rooms of the fortifications were used to store ammunition and charges which were brought along Military Road, giving
18-710: The mid-19th century. In contrast to smooth bore cannon which preceded it, the rifling of the gun barrel allowed much greater accuracy and penetration as the spin induced to the shell gave it directional stability. Initially smooth-bore cannon were converted into rifles by re-boring and lining; but later new guns were manufactured from scratch as RMLs. The RML 9 inch 12 ton gun could discharge shells weighing 249 pounds (113 kg) as far as South Head (Watsons Bay); approximately 3,000 yards (2,770 metres). As technology improved, these cannons were replaced in 1889 by much lighter weight guns that could fire an 80-pound (36 kg) projectile for 3,170 yards (3,000 metres). From 1903 to 1907
24-547: The road its name. Georges Heights, New South Wales Georges Heights is an urban locality in the suburb of Mosman , adjoining Sydney , in the state of New South Wales , Australia . Georges Heights is located in the local government area of the Municipality of Mosman and is part of the Lower North Shore . Georges Heights was named after King George III , who reigned from 1760 to 1820, which
30-476: Was built in 1877 and became part of the Sydney Harbours outer defences . At the time this method of fortification was considered to be the most efficient way of defending this entry point into Sydney Harbour. The two cannons that were first placed at the site were RML 9 inch 12 ton guns . Rifled Muzzle Loaders (RMLs) are artillery pieces loaded from the muzzle, but with a rifled bore liner, invented in
36-597: Was during the time that the First Fleet left Portsmouth , England in 1788 and arrived in what is now Sydney Harbour . The Georges Head Battery located in Georges Heights was constructed in 1871. A naval depot stands on the eastern side of Chowder Bay. Georges Heights has a number of heritage-listed sites, including: 33°49′55″S 151°15′32″E / 33.832°S 151.259°E / -33.832; 151.259 This article related to
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