EXPLANATION OP OCEAN TEMPERATURE CHART No. 23. 



MATINICUS ROCK LIGHT-HOUSE, MAINE. 



Observer: William G. Grant. 



Location of slalion — Maliiiicus Roik is a bare, rocky ialut, about 80 milis easterly from Scguiu Island, and about 

 14 mile.s snutb of Viiial Haven Island, at the moiitli of Penobscot Bay, the nearest large piece of land. It i.s about 2J 

 mile.i SE. of Ragged Islam!, which is close to Matinicus Island and between the latter and Matinicus Rock. Within 

 a radius of a mile the water deepens rapidly from 4 to 45 fathoms. 



GeoijraphiQal /)(.si(ion.— Latitude, 43° 47' 01" N. ; longitude, 68° 51' 20" W. 



Dt'ptli of uaUr. — Six to 12 fathoms. 



r.antje of temperature (March 1 to January 1).— Air, 42° (2."?° to C5°); surface, 21°.5 (:i2°.5 to 54°). 



Maiinicus Rock and Mount Desert Ruck present the shortest range of surface temperature of any of the stations 

 north of the Florida Reefs, being 7° sliortcr than at Nantucket New South Shoal light-ship. The surface and air 

 inaxiiniiiiis for Matinicus Rock are also the lowest of any reconlrd. The surface curves are very regular and 

 uiiiriuin frnni year to year. Unfortunately, there are nearly as many omissions m the surface records for this station 

 as for Boon Island, but they are seldom frequent except during the colder months. 



Table shomiig the cliriClion of the winds, by quadrants, for each niotdh of the year, being the means of Jive years' obsirtations. 



220 



