42 U. S. COAST AND GEODETIC SURVEY 



Table 7. — Current Harmonic Constants. Atlantic Coast Lightships — Con. 



Charleston Lightship 



days beginning June 7, 1912. Magnetic variation 1° west 



Martins Industry Lightship 



87 days beginning June 17, 1912. Directions are true 



Epochs apply to times of maximum flow in a north or east direction. The local epochs refer to the local 

 Meridan, Greenwich epochs to the Greenwich meridian. 

 For reference to above table, see p. 22. 



