Continued entries/extra info

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The Tide in the Firth of Tay flows from the ocean to a point about a mile above Perth and rises at Perth Harbour to a height 10 feet above the bed of the stream Some recent operations consisting chiefly of joining islets with the main land and throwing up embankments have encreased the rise of the tide at Perth 9 inches and accelerated the time of high water half an hour and would if completed occasion a still additional rise of nearly three feet and render the ordinary navigation to Perth harbour practicable for vessels of 300 tons. The level of high water at Perth owing to the configuration of the Firth the narrowness of the inlet at Broughty ferry and the scope afforded for rolling back the fresh water current from Newburgh upward is usually 18 inches higher than the level in the broadest part of the Firth or between Balmerino and Kingoodie. Fullartons Gazeteer of Scotland.

Owing to local circumstances the line of low water is liable to frequent changes as is also the boundary line of all the sand banKs. There are buoys fixed in several places throughout the firth and there are two beacons near Dundee Harbour.