captain in 1872. In 1865 he was appointed Chief Assistant to the Hydrographer to the Admiralty, Captain George Henry Richards, while continuing to the head of the magnetic department. In 1874 he succeeded Richards as Hydrographer, a post he held until 1884. In this position he was responsible for the charts, pilot guides and other publications of the Admiralty. He was invested as a Companion of the Order of the Bath in May 1873, and promoted to Knight Commander of the same order in the 1881 Birthday Honours. He was vice-president of the Royal Geographical Society from 1879 to 1881, and president of the geographical section of the British Association in 1876. After resigning the post of hydrographer, Evans was appointed one of the British delegates to the International Meridian Conference held at Washington, D.C. in 1885, to fix a prime meridian and universal day. He died at his residence, 21 Dawson Place, Pembridge Square, London, on 20 December 1885. He had married, on 12 November 1846, Elizabeth Mary, eldest daughter of Captain Charles Hall, R.N., of Plymouth. Published work Following the survey work in New Zealand in Acheron, and the subsequent work by Commander Byron Drury in , Richards and Evans published the 'New Zealand Pilot' in 1856. This went through a number of editions, the fourth appearing in 1875. In 1858 Evans prepared a 'Chart of Curves of Equal Magnetic Variation,’ which was published by the Admiralty. In 1860 he wrote a valuable 'Report on Compass Deviations in the Royal Navy'. This treated of the magnetic character of the various iron ships in the navy, and also of the , and was his first work to be published in the Philosophical Transactions of the Royal Society. His most important work was the 'Admiralty Manual for Deviations of the Compass,’ of which Smith and himself were joint editors (1st ed. 1862, 2nd ed. 1863, 3rd ed. 1869). A simple account of the same subject was issued by Evans in 1870 as an 'Elementary Manual for Deviations of the Compass.' These have become standard textbooks, having been translated and adopted by all the great maritime nations. His published work in the Philosophical Transactions of the Royal Society appeared between 1860–1872. Subsequently, Evans devoted much attention to terrestrial magnetism. He compiled the magnetical instructions for the observers on board in 1872, and delivered a lecture on the 'Magnetism of the Earth'