TY - JOUR T1 - Letter from Captain Basil Hall, R. N. to Captain Kater, Communicating the Details of Experiments Made by Him and Mr. Henry Foster, with an Invariable Pendulum; In London; At the Galapagos Islands in the Pacific Ocean, Near the Equator; At San Blas de California on the N. W. Coast of Mexico; And at Rio de Janeiro in Brazil. With an Appendix, Containing the Second Series of Experiments in London, on the Return JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 113 SP - 211 EP - 285 PY - 1823/01/01/ UR - http://dx.doi.org/10.1098/rstl.1823.0022 M3 - doi:10.1098/rstl.1823.0022 AU - Hall, B. ER -