EXPLANATION OP OCEAN TEMPERATURE CHART No. 15. 



BLOCK ISLAND SOUTHEAST LIGHT-HOUSE, KHODE ISLAND. 

 Observer: H. W. Clahk. 



Location of slat ion. — This ligbt-hoiise is located on tbo liigli bliifl' at the smillieasteru extremity of Block Islaud, 

 and is distant 82 miles northeasterly from Firo Island Light-house, and 78J miles W. by N. J N. from Nantucket New 

 South Shoal light- ship. The water is very shallow oti' the southeni eudof the island, the depths increasing gnidually 

 seaward. The 20-fathom curve is distant about 5 miles; the 100-fathom curve, about 70 miles. 



Geograi)hicalposilion.—'La.t\im\e, 41° 09' 10" N., longitude, 71° 33' 09" W. 



Depth of !c«(fr.^The observations were taken at the edge of the beach, below the light-house, facing the open sea 

 to the south. 



Range of temperature (March 1 to Jannary 1). — Air, 57° (22° to 79°); surface, 41° (29°. 5 to 70°..5). 



Although tho observations wore taken from the beach, the snrAice curves show little direct inlluence of the air 

 temperature upon the water, and are comparatively regular. The maximum air temperature is about the same as at 

 Absocon, N. .J., but the maximum for the surface is four degrees lower than at any of the stations 1o the west and 

 south. 



Table showing the direction of the winds, Jty quadrants, for cc^ih month of the year, being the means of five years' observations. 



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