A treatise on magnetism
Subtitle: with a description and explanation of a meridional and azimuth compass, for ascertaining the quantity of variation, without any calculation whatever, at any time of the day. Also improvements upon compasses in general. With tables of variation, for all latitudes and longitudes.
By: By Ralph Walker ...
Publisher: Printed by R. Hindmarsh, sold by G. Adams [etc.]
Published: 1794
Place of publication: London
Language: eng
Number of pages: 226
Subjects: Geomagnetism -- Early works to 1800.