eighteenth century. Benjamin Heath Malkin, and Thomas Rees are noted as having written biographical articles, but there is no information about which. The rest of the authors cannot be positively identified except for William Tooke, who wrote about Catherine the Great. Many of the biographical articles are sourced to the biographical reference books noted in 3.3 above. In most cases Christian names are Anglicised – John for Johannes, for example. The music articles These were written by Charles Burney (1726–1814), with additional material by John Farey, sr (1766–1826), and John Farey, Jr (1791–1851), and illustrated by 53 plates as well a numerous examples of music typset within the articles. Charles Burney was well-known as the author of A General History of Music, 4 vol 1776–1789 and two travel diaries recording his Musical Tours collecting information in France and Italy, and later Germany, 1+2 vol, 1771 and 1773, as well as the Commoration of Handel, 1785 and his Musical Memoirs of Metastasio, 1796. John Farey, sr was a polymath, well known today for his work as a geologist and for his investigations of mathematics. He was greatly interested in the mathematics of sound, and the schemes of temperamant used in tuning musical instruments then, and published much about it in contemporary periodicals. His son, John Farey, jr, was also polymathic in his interests. He contributed numerous drawings for the illustrations of mostly technological and scientific topics in Rees, and would have written the descriptions of them. They are always linked by key-letters to the details of the drawings. The procedure would have been for Farey to make the drawing first, after usually inspecting and measuring the object, then write the description of it, with the key letters, which were then engraved on the plate for final printing. The plates for dramatic machinery, the organ and barrel organ are by him. Contributors The Cyclopædia was written by about 100 contributors, most of whom were Nonconformists. They were specialists in their fields, covering science, technology, medicine, manufacturing, agriculture, banking and transportation, as well as the arts and humanities. A number were members of the teaching staffs of the Royal Military Academy, and the Addiscombe Military Seminary of the East India Company. Other contributors were working journalists who wrote for scientific, medical and technical periodicals. Several of the contributors were active in radical politics; one was gaoled for sedition and another indicted for treason.