Walker, R. (1794). A treatise on magnetism: 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 Ralph Walker, of Jamaica. printed by R. Hindmarsh, printer to his Royal Highness the Prince of Wales, Old-Bailey. sold by George Adams, No. 60, Fleet-Street; Peter Elmsley, No. 87, Strand; John Sewell, No. 32, Cornhill; David Steel, No. 1, Union-Row, Little Tower-Hill; and; John and Arthur Arch, No. 23, Gracechurch-Street, Corner of Lombard-Street.
Chicago-Zitierstil (17. Ausg.)Walker, Ralph. A Treatise on Magnetism: 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 Ralph Walker, of Jamaica. London: printed by R. Hindmarsh, printer to his Royal Highness the Prince of Wales, Old-Bailey. sold by George Adams, No. 60, Fleet-Street; Peter Elmsley, No. 87, Strand; John Sewell, No. 32, Cornhill; David Steel, No. 1, Union-Row, Little Tower-Hill; and; John and Arthur Arch, No. 23, Gracechurch-Street, Corner of Lombard-Street, 1794.
MLA-Zitierstil (9. Ausg.)Walker, Ralph. A Treatise on Magnetism: 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 Ralph Walker, of Jamaica. printed by R. Hindmarsh, printer to his Royal Highness the Prince of Wales, Old-Bailey. sold by George Adams, No. 60, Fleet-Street; Peter Elmsley, No. 87, Strand; John Sewell, No. 32, Cornhill; David Steel, No. 1, Union-Row, Little Tower-Hill; and; John and Arthur Arch, No. 23, Gracechurch-Street, Corner of Lombard-Street, 1794.