135 



Days of 



the 

 month. 



June 13 



North 

 lat. 



34° 30' 



14 



32 16 



West 

 long. 



16° 55 



15 



30 36 



17 4 



16 54 



PHYSICAL OBSERVATIONS. 



Dip of the magnetic needle, 73*0% 



found in a dead calm. 

 Magnetic intensity, 234 oscillations. 



To the east of the isle of Madeira, 

 at forty-five leagues distance 

 strong breeze from the west ; sea 

 very rough. 



Temperature of the sea, notwith- 

 standing the height of the waves, 

 111 0 ', temperature of the air, 

 16-8°. 



Dip of the magnetic needle, 71 '90°, 

 somewhat doubtful (latitude 31° 

 46', longitude, 17° 4'). 



Magnetic intensity, 237, very doubtful. 



Fine weather,sea almost entirely calm. 



Temperature of the water, 18*7° , 

 temperature of the air,20'6°. 



Progressive variations of the hygro- 

 meter and thermometer observed 

 carefully in the shade, and four 

 metres above the surface of the 

 ocean : 



Hours. 

 At 21 J 



Saussure's 

 hygrom. 

 85 3° 



Centigrade 

 therm. 

 21*2° calm. 



22jj 



857 



20*0 little wind. 



23J 



858 



20-0 idem. 





853 



21'4 calm. 



n 



84'2 



23-7 idem. 



si 



843 



22*5 idem. 





852 



20-0 idem. 



n 



86-2 



19* 8 idem. 



