yes i believe he is talking about the 10 to 14 inch disappearing rifles that were placed at the entrances to harbours (really intriguging: guess they didn't think the enemy would land anywhere else).
here is one site that deals with pre-dreadnought coastal fortss and weapons, world wide, with links to everything coastal. http://www.oz.net/~markhow/pre-dred/coastal.htm 
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“If we should have to fight, we should be prepared to do so from the neck up instead of from the neck down.”— General James H. Doolittle, USAAF
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