We had Moncrief disappearing gun carriages at the entrance to Port Phillip Bay in Melbourne.
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The seaward entrance to Melbournes' Port Phillip Bay was (all now only tourist sites) well covered by guns on both sides which were built in the early 1880's. Fort Queenscliff on the left and Fort Nepean on the right. There were actually five forts (another on the right and two inside the bay covering the channels) in this area all with fully interlocking arc's of traverse.
The distance across the entrance is only just over 3 kilometres as you can see, so the definition of Point Blank range comes to mind.
The 11 inch guns were fully traversible and disappearing - rise to fire then descend to load which made them difficult to hit by enemy fire should that have ever happened.
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