TY - JOUR T1 - A Letter to the Right Honourable the Earl of Macclesfield, President, the Council, and Fellows, of the Royal Society, concerning the Variation of the Magnetic Needle; With a Sett of Tables Annexed, Which Exhibit the Result of Upwards of Fifty Thousand Observations, in Six Periodic Reviews, from the Year 1700 to the Year 1756, Both Inclusive; And are Adapted to Every Five Degrees of Latitude and Longitude in the More Frequented Oceans. By William Mountaine and James Dodson, Fellows of the Royal Society JF - Philosophical Transactions (1683-1775) VL - 50 SP - 329 EP - 349 PY - 1757/01/01/ UR - http://dx.doi.org/10.1098/rstl.1757.0042 M3 - doi:10.1098/rstl.1757.0042 AU - Mountaine, W. AU - Dodson, J. ER -