| 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 Point St. Franciso Maranham'.
Each page is headed: 'Observations on the Horary Changes of a Magnetic Needle, at Maranham'. |