JAXAshby wrote:
Its a lock because it was built as a lock and continues to function as a
lock.


it does not function as a lock. it functions as a gate, which you plainly
state below (even as you fumb duckly say is "not relevant").


The fact that it is only used to when the current runs north
(as I pointed out in my first post) is not relevant.



It functions as a gate when the current runs south, as a lock when its
north. This seems to be too complex for your little mind to comprehend.