26 



U. S. COAST AND GEODETIC SURVEY 



near the circles. At times of spring tides and perigean tides, the veloci- 

 ties normally are greater and at times of neap tides and apogean tides, 

 less than those given on the charts. The spring and perigean effects 

 are practically equal in this locality, each producing a velocity increase 

 above the mean of about 20 percent. When spring and perigean 

 effects combine, the velocities of the tidal current are greatest. When 

 neap and apogean effects combine, the velocities of the tidal current 

 are least. Winds and other meteorological conditions at times modify 

 both the direction and the velocity of the current. 



Table 1. — Atlantic Coast Lightship Current Stations, Depth of Water, 

 and Distance from Land 



Lightship station 



Portland 



U. S. S. EaHhamfton 



Boston 



Pollock Rip Slue 



Pollock Rip (1934-35) 



Stone Horse Shoal (1934-36)... 



Shovelful Shoal 



Stone Horse Shoal (1918-19)... 



Pollock Rip (1911) 



Great Round Shoal 



Nantucket Shoals 



Handkerchief 



Cross Rip 



Hedge Fence 



Vineyard Sound 



Hen and Chickens 



Brenton Reef 



Ram Island Reef 



Bartlett Reef 



Cornfield Point 



U.S. S. Finch 



Fire Island 



U. S. S. Cardinal 



Ambrose Channel (1912-22) ... 

 Ambrose Channel (1936-38) ___ 



Lightship station 



Scotland 



Barnegat 



U. S. S. Falcon 



Northeast End 



Five Fathom Bank 



Overfalls 



Fenwick Island Shoal 



Winter-Quarter Shoal 



U. S. S. Brant 



Cape Charles 



Chesapeake 



Tail of the Horseshoe 



Diamond Shoal (1909-18) 



Diamond Shoal (1919-28) 



Cape Lookout Shoals (1912) . . 

 Cape Lookout Shoals (1918- 



19) 



Frying Pan Shoals 



U. S. S. Lonn Island 



Charleston (1912-16) 



Charleston (1921) 



Martins Industry 



Savannah 



Brunswick 



St. Johns 



Depth of 

 water 



Feet 

 63 

 78 



180 

 84 

 91 

 66 

 90 

 78 



180 

 39 

 63 

 36 



180 



174 

 78 



90 

 60 

 90 

 39 

 42 

 52 

 48 

 50 

 57 



Distance 

 from land 



Nautical 

 miles 



3 



7 

 47 

 13 

 16 



3 

 13 

 16 

 44 



7 

 12 



3 

 13 

 13 

 17 



19 

 18 

 22 

 7 

 8 

 11 

 10 

 13 

 5 



For reference to above table, see p. 20. 



