IV CONTENTiS 



Figure Page 



17. Nontidal currents at lightship stations, Port Royal Sound to St. Johns 



River 26 



18. Wind currents at lightship stations, Cajae Elizabeth to Point Judith 26 



19. Wind currents at lightship stations, Montauk Point to Barnegat Bay__ 26 



20. Wind currents at lightship stations. Cape May to Cape Hatteras 26 



21. Wind currents at lightship stations, Cape Lookout to Charleston Har- 



bor 26 



22. Wind currents at lightship stations. Port Royal Sound to St. Johns 



River 26 



23. Currents at time of Greenwich transit (2 hours 30 minutes after low 



water at Boston) . 26 



24. Currents 1 hour after Greenwich transit (2 hours 45 minutes before 



high water at Boston) 26 



25. Currents 2 hours after Greenwich transit (1 hour 45 minutes before 



high water at Boston) 26 



26. Currents 3 hours after Greenwich transit (45 minutes before high water 



at Boston) 26 



27. Currents 4 hours after Greenwich transit (15 minutes after high water 



at Boston) 26 



28. Currents 5 hours after Greenwich transit (1 hour 15 minutes after high 



water at Boston) 26 



29. Currents 6 hours after Greenwich transit (2 hours 15 minutes after high 



water at Boston) 26 



30. Currents 7 hours after Greenwich transit (2 hours 55 minutes before low 



water at Boston) 26 



31. Currents 8 hours after Greenwich transit (1 hour 55 minutes before low 



water at Boston) 26 



32. Currents 9 hours after Greenwich transit (55 minutes before low water 



at Boston) 26 



33. Currents 10 hours after Greenwich transit (5 minutes after low water 



at Boston) 26 



34. Currents 11 hours after Greenwich transit (1 hour 5 minutes after low 



water at Boston) 26 



35. Currents 12 hours after Greenwich transit (2 hours 5 minutes after low 



water at Boston) 26 



TABLES 



1. Atlantic Coast lightship current stations, depth of water and distance 



from land 26 



2. Observed currents, Atlantic Coast lightships, strengths and slacks 27 



3. Tidal currents, Atlantic Coast lightships, strengths and slacks 29 



4. Tidal currents, Atlantic Coast lightships, strengths and minimums 30 



5. Hourly velocities and directions of the tidal current, Atlantic Coast 



lightships 32 



6. Times of high water and low water at locations along the Atlantic 



Coast of the United States 36 



7. Current harmonic constants, Atlantic Coast lightships, north and east 



Components 36 



8. Current harmonic constants, Atlantic Coast lightships, 369-d9y series. 43 



9. Current harmonic constants, Atlantic Coast lightships, series less than 



369 days 44 



10. Hourly directions and velocities of the solar diurnal current, Atlantic 



Coast lightships 45 



11. Nontidal currents by months, Atlantic Coast lightships 47 



12. Wind currents, Atlantic Coast lightships 55 



13. Average current velocities accompanying various wind velocities, 



Atlantic Coast lightships 68 



14. Average deviation of current direction to right of wind direction, At- 



lantic Coast lightships 69 



15. Average ratio of current velocity in knots to wind velocity in statute 



miles per hour, Atlantic Coast lightships 70 



