MAGNETIC TERM-DAY OBSERVATIONS 



MAGNETIC OBSERVATORIES AT EWING HARBOR, CAPE ORFORD, (OREGON TERR.;) SAN 

 FRANCISCO, PRESIDIO ; NEE-AH BAY, SCARBOROUGH HARBOR, CAPE FLATTERY. 



DIFFERENTIAL OBSERVATIONS OF DECLINATION IN 1851 AND 1852. 



The instrument used is theodolite magnetometer No. 3, and the observations wejje taken in a tent. 

 Increasing scale readings denote a movement of the north end of the magnet to the east. 



EWING HAKBOK OBSEKVATORY. 



Latitude, 42 44' 22". Longitude, 124 28' 52" (8h. llm. 55s.) west of Greenwich. 



NOVEMBER 88, 1851. 



