port-duty

A highway, a bridge, a navigable canal, for example, may in most cases be both made and maintained by a small toll upon the carriages which make use of them: a harbour, by a moderate port-duty upon the tunnage of the shipping which load or unload in it.

I. Book V. Of the Expences of the Sovereign or Commonwealth 1909

To close with the American distinction, this revenue was _external_ or port-duty; but again, to soften it to the other party, it was a duty of _supply_.

The Works of the Right Honourable Edmund Burke, Vol. 02 (of 12) Edmund Burke 1763