Can an inverted vessel (ספל) affixed to the top of a wall reduce its effective height to enable carrying or joint eruv?

Synopsis

An inverted vessel placed atop a ten-handbreadth wall may reduce the wall's effective height. The question concerns whether this enables carrying on the full wall or only opposite the vessel.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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