. Coastal currents along the Atlantic coast of the United States. Ocean currents; Tides. 10 U. S. COAST AND GEODETIC SURVEY A characteristic feature of the rotary current is the absence of slack water. Although the current generally varies from hour to hour, this variation from greatest current to least current and back again to greatest current does not give rise to a period of slack water. When the velocity of the rotary tidal current is least, it is known as the minimum current, and when it is greatest it is known as the maximum current. The minimum and maximum velocities of the North k Mid
. Coastal currents along the Atlantic coast of the United States. Ocean currents; Tides. 10 U. S. COAST AND GEODETIC SURVEY A characteristic feature of the rotary current is the absence of slack water. Although the current generally varies from hour to hour, this variation from greatest current to least current and back again to greatest current does not give rise to a period of slack water. When the velocity of the rotary tidal current is least, it is known as the minimum current, and when it is greatest it is known as the maximum current. The minimum and maximum velocities of the North k Midnight 12 Noon 12. ^ Scale of Knots I I I I I I I I I I I I ^ i.£ Figure 5.—Rotary current, Nantucket Shoals Lightship, forenoon of July 30, 1922. rotary current are thus related to each other in the same way as slack and strength of the rectilinear current, a minimum velocity following a maximum velocity by an interval of about 3 hours and being followed in turn by another maximum after a further interval of 3 hours. Since the current day corresponds to the tidal day, it is convenient, in determining the average hourly velocity and direction of the rotary current, to make use of the times of high and low water at some. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haight, Frank Joshua, 1893-; U. S. Coast and Geodetic Survey. Washington [D. C. ] : U. S. Govt. Print. Off.
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