Shewing the Sands and Depth of water with the flowing of the Tides and Setting of the Current as they were Observed in the year 1701 by Capt Edmund Halley by his Majesties command.
In the channel the smaller figures are in depth in fathoms. The Roman figures show the hour of High water, at the end of the stream that sets to the East on the day of the New and Full moon.
