describes as what shippers of goods, charterers of vessels, and
shipowners would mean by a port, that is to say, that a legal port
might be according to the general understanding of the classes of
persons described by Lord Esher, either restricted or enlarged by
mercantile usage. There are, however, some. well recognized
elements which, I think, according to any usage one would expect
to find. I do not know that those ordinary elements are anywhere
more concisely set forth than in the Treatise ascribed to Sir Matthew
Hale (Hargraves' Law Tracts, 46)." His Lordship went on to quote
the well known passage. All or nearly all of those elements of a
port are to be found in Sullivan's Cove as the area containing the
port of Hobart. His Lordship quoted with approval the language
of Lord Esher in the last cited case (1), where he says that if the
port authorities as known in commercial business language exercise
authority over ships within a certain space of water, and the ship-
owners and shippers who have ships within that space are sub-
mitting to the jurisdiction which is claimed by those authorities,
whether legally or not, their submission to such authority is to be
accepted as strong evidence that the shipowners, the shippers and -
the port authorities have all come to the conclusion to accept that
space of water in which that authority is so exercised and submitted
to as "the port" of the place. See Lord Esher's judgment already
alluded to (2). The port discipline appears to have been exercised
and submitted to within the area contained in Sullivan's Cove, and
within it are the wharves and quays of Hobart, the business places
of the town, and the Customs House, and it is there that vessels
bound to or from the port of Hobart unload and load. The Marine
Board, however, have exercised jurisdiction over the larger area
for which the defendants contend. The area over which the com-
mercial transactions proper to a port are carried on is probably
confined to Sullivan's Cove, and certainly does not extend beyond
the debouchment of the Derwent into Storm Bay. It is interesting,
though not very material in this regard, to refer to a Gazette notice
of 26th June 1894 authorizing pilotage charges for ships entering
or leaving the waters northward of an imaginary line from the
Derwent Light to Pearson's Point on the opposite side. In the
(1) 15 Q.B.D., at p. 588. (2) 15 Q.B.D., at p. 590.