Queensland State Archives posted a photo:
While Fort Lytton was originally defended by four muzzle-loading heavy guns (two 80pdrs and two 64pdrs), by 1888 the 80 pdr guns were replaced with two 6inch 100pdr breech-loading disappearing guns. Five years after that, the defences were increased with the addition of two quick-firing Hotchkiss 6pdr guns. These disappearing guns continued in operation until 1938. During the Second World War Fort Lytton’s defences also included a 4.7inch naval gun and a twin 6 pounder rapid-fire gun which was remotely controlled from a 15m high lookout tower.
Description source:
Wikipedia
View the original record at the Queensland State Archives:
Item ID 2692229