38 



U. S. COAST AND GEODETIC SURVEY 



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



Constituent 



North component 

 (magnetic) 



Veloc- 

 ity 

 H 



Qcnots) 



Epoch 



Local 



M 

 (de- 

 grees) 



Green- 

 wich 

 (de- 

 grees) 



East component 

 (magnetic) 



Veloc- 

 ity 

 H 



(knots) 



Epoch 



Local 



(«) 

 (de- 

 grees) 



Green- 

 wich 

 (de- 

 grees) 



Chesapeake Lightship 



369 days beginning March 29, 1935. 

 Magnetic variation 7° west 



282 

 174 



58 

 148 

 173 

 275 

 226 

 246 

 264 

 146 

 346 

 264 

 290 

 260 

 200 

 162 



10 

 190 



North component 

 (magnetic) 



Veloc- 

 ity 

 H 



(knots) 



Epoch 



Local 



M 

 (de- 

 grees) 



Green- 

 wich 

 (de- 

 grees) 



East component 

 (magnetic) 



Veloci- 

 ity 

 H 



(knots) 



Epoch 



Local 



(«) 

 (de- 

 grees) 



Green- 

 wich 



(de- 

 grees) 



Diamond Shoal Lightship 



369 days beginning January 1, 1921. 

 Magnetic variation 6° west 



Diamond Shoal Lightship 



369 days beginning January 1, 1922. 

 netic variation 6° west 



Mag- 



74 



27 

 304 

 127 



50 

 211 



90 



22 



188 



7 



277 



171 



17 

 129 



22 

 229 



57 

 222 



Cape Lookout Shoals Lightship 



369 days beginning September 27, 1918. 

 Magnetic variation 4° west 



Frying Pan Shoals Lightship 



369 days beginning September 27, 

 Magnetic variation 3° west 



213 



71 



20 

 129 



53 

 241 

 317 

 305 



82 



40 

 183 

 222 



70 

 252 



66 

 235 

 116 

 245 



Frying Pan Shoals Lightship 



369 days beginning January 1, 1920. 

 netic variation 3° west 



