the Earth's Magnetic Force in Absolute Measure, London, 1848. The Elements of Optics, Dublin, 1849. Address delivered at the opening meeting of the British Association for the Advancement of Science, held at Dublin 26 Aug 1857, Dublin, 1857. Is it a Sin? An Inquiry into the Lawfulness of Complying with the Rule of the National Board relative to Religious Instruction, published anonymously, Dublin, 1860. The Climate of Ireland and the Currents of the Atlantic, a lecture, Dublin, 1865. Observations made at the Magnetical and Meteorological Observatory at Trinity College, Dublin, Dublin, 1865. The University of Dublin in its Relations to the several Religious Communities, anonymous, Dublin, 1868. The Doctrine of Absolutism, Dublin, 1871. Treatise on Magnetism, General and Terrestrial, London, 1874. Miscellaneous Papers connected with Physical Science, London, 1877. Family Lloyd married, in July 1840, Dorothea, only daughter of the Rev. James Bulwer, rector of Hunworth-cum-Stody, Norfolk. He had no children. Notes References External links 1800 births 1881 deaths Alumni of Trinity College Dublin Fellows of the Royal Society Fellows of Trinity College Dublin Honorary Fellows of the Royal Society of Edinburgh Irish physicists Magneticians Presidents of the Royal Irish Academy Optical physicists Scientists from Dublin (city) Provosts of Trinity College Dublin Recipients of the Pour le Mérite (civil class) Scholars of Trinity College Dublin