TY - JOUR T1 - A Letter from Mr. William Mountayne, F. R. S. to the Right Honourable James Earl of Morton, President of the Royal Society, containing Some Observations on the Variation of the Magnetic Needle, Made on Board the Montagu Man of War, in the Years 1760, 1761, and 1762, by Mr. David Ross, Surgeon JF - Philosophical Transactions (1683-1775) VL - 56 SP - 216 EP - 199 PY - 1766/01/01/ UR - http://dx.doi.org/10.1098/rstl.1766.0025 M3 - doi:10.1098/rstl.1766.0025 AU - Mountayne, W. AU - Ross, D. ER -