Found in 45 Collections and/or Records:
The author of the note may be [Badiase] and refers to comments by Charles Messier and Pierre Mechain. On the reverse of the note is a record of observations, possibly in the hand of Nevil Maskelyne.
Correspondence regarding the effect of magnetic variation on the mariner's compass, the use of magnetic variation to establish longitude and the cause of magnetic variation.
Correspondence relating to the National Physical Laboratory and magnetism, including letters concerning the magnetic declination of London and Paris in the early 19th century, with a graph, 1953, and correspondence with Dr E.C. Bullard of the National Physical Laboratory regarding J. Flamsteed's magnetic observations, 1952.
Papers concerned with determining longitude and latitude at sea, with miscellaneous observations.
The accounts of printers and publishers for Board of Longitude publications, with miscellaneous accounts.
Letter, observations and a drawing.
Letter and printed prospectus.
Sent to Nevil Maskelyne.
Correspondence regarding various astronomical and nautical tables.