EXPLANATION OF OCEAN TEMPERATURE CHART No. 10. 



WINTER-QUARTER SHOAL LIGHT-SHIP, VIRGINIA. 

 Ohservcr: C. Lixdemanx. 



Location of station . — This ligbt-.ship is aucborcd2 miles SE. by E. i E. from Wiutcr-Quarter Shoal, and 8-} miles off 

 Assatcague Island, ou the coast of Virginia. It is about midway between Chesapeake Bay and Delaware Bay 

 entrances, and about 1'28 miles north of Body's Island light. Between the light-ship and the mainland depths of 4 

 to 10 fathoms occur. The 20-fathom curve is distant about 20 miles, the 100-fathom curve nearly 50 miles. 



GeograiiUcal position.— LsLlitrxdid, 37° 57' (03") N. ; longitude, 75° 05' (29") W. 



Depth of water. — Ten and one-half fathoms. 



Hange of temperature (March 1 to January 1). — Air, 48° (33° to fcl°); surface, 41° (35°. 5 to 76° .5.) 



Winter-Quarter Sho.al light-ship may bo regarded as the southernmost of a third series of stations in which the 

 surface temperature seldom exceeds 75° F., and within the period plotted (March to January) may fall (according to 

 t;he record.^) to nearly 3.5°. The surface curves are somewhat less uniformly parallel with the air curves than at the 

 more southern stations, but the ditfereuces are not very marked. 



TaMe showing the direction nf the winds, bij quadrants, for each month of the year, ieing the means office years' observations. 



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