of this type to be made at the Woolwich Gun Foundry. These sited at three main gun positions, including W battery containing two guns on 'C' pivots (rotating around a reused Georgian cannon set upright in the ground). Each gun weighed 7 tons and had a charge of gunpowder able to fire a Palliser shot at per second. This could pierce of armour at . It was proposed to replace the guns with larger versions in 1888 but this was never put into action. It had a large, underground, main gunpowder magazine, and high. The fort was staffed by 50 officers and men of the Coast Brigade, Royal Artillery, but no shots were ever fired in action. In 1897, following wireless transmissions from Lavernock Point in Wales and Flat Holm, Guglielmo Marconi moved his equipment to Brean Down and set a new distance record of for wireless transmission over open sea. The end of the fort's active service came at 5 a.m. on 6 July 1900 when the No. 3 magazine which held 3 tons (3 tonnes) of gunpowder exploded. An inquiry found that Gunner Haines had fired a ball cartridge down a ventilator shaft causing the explosion, after being put on a charge for returning late to barracks, however this explanation has been challenged. The wall separating the fort from the moat on the south west corner was demolished and wreckage thrown up to . No one knew why the gunner had blown up the fort, but it has been speculated that it was an act of suicide. The cannons were hauled away by traction engines. It was then used as a café, owned by the Hillman family from at least 1907 until sold in 1936 to the 'bird sanctuary people'. World War II On the outbreak of World War II the fort was rearmed with two six-inch ex-naval guns and two searchlights as a Coastal artillery battery. The site was also used as a test launch site for rockets and experimental weapons. Two gun positions were built to mount the ex-naval guns in their turrets. These were later protected with a "plastic" anti-aircraft roof. One position was built over the ruins of the old west battery and the other partly obscures the north west battery. The barrack blocks were converted and the windows partly blocked to reduce the effects of blast. Several other associated structures, including searchlight batteries