Description | Daily magnetic observations, in three columns, recording hourly position of the north end of the dip needle [degrees, minutes, seconds] at appointed observation times, with temperature [in Fahrenheit].
With a title page: 'Horary Variation of a Magnetic Needle Padre's House Island of Fernando Noronha'.
Each page is headed: 'Observations on the Horary Changes of a Magnetic Needle, at Fernando de Noronha'. |