EXPLANATION OF OCEAN TEMPERATURE CHART No. 22. 



SEGUIN ISLAND LIGHT- HO USE, MAINE. 

 Observer: Thomas Day. 



Xiooation of station. — Seguiu Island is a small rooky island with precipitous shores, located about 2^ miles off the 

 nearest part of the mainland, on the east side of the entrance to Kennebec River, and about 47 miles northeasterly from 

 Boon Island. Between Seguin Island and the shoals bordering the adjacent mainland depths of 3| to 9 fathoms oecnr, 

 and off the island a depth of 40 fathoms is reached within a distance of 3J miles. The light is placed on the wcsterc 

 side of the island where the water is from 6 to 8 fathoms deep close inshore. 



Geographical position.— L,a,titu&e, 43° 42' 26" N. ; longitude, 69° 45' 32" W. 



Depth of water. — Six fathoms. 



Bange of tempuratiire (March 1 to January 1).— Air, 46°.5 (24° to 70°.5); surface, 2o° (33° to 58°). 



This station has a shorter range of temperature for both the air and surface than Boon Island. The maximum air 

 temperature is 3°, the maximum surface temperature 4°, lower than at Boon Island. Both the air and surface curves 

 are more regular than at the preceding station, and more uniform for all the years. 



Table showing the direction of the loinds, by quadrants, fur each month of the year, being the means of five years' observations. 



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