Amongst the eminent writers engaged by Rees were Dr Lant Carpenter (1780–1870) on education, mental and moral philosophy; Tiberius Cavallo (1799–1809) on electricity and magnetism; John Flaxman (1755–1826) on sculpture; Luke Howard (1772–1867) on meteorology; John Landseer (1769–1852) on engraving; Sir William Lawrence, (1783–1867) on human and comparative anatomy; Sir James Edward Smith (1759–1828) on botany; David Mushet on metallurgy and chemistry; Rev. William Pearson (1767–1847) on astronomy; Sir Thomas Phillips (1770–1875) on painting. Among the artists and engravers employed were Aaron Arrowsmith (1750–1823) who engraved the maps; William Blake (1757–1827) who made engravings to illustrate some of the sculpture articles; Thomas Milton (1743–1827) who engraved most of the natural history plates; Wilson Lowry (1762–1824) who engraved numerous of the plates especially those relating to architecture, machinery and scientific instruments. Except for some of the botanical articles by Sir James Edward Smith, none of the articles are signed. Names were recorded in the Prospectus of 1802, the introduction at the start of the first volume, the paper covers of the unbound parts which have survived, and in a paper in the Philosophical Magazine, published in 1820. The alphabetical List of contributors to Rees's Cyclopædia has been compiled from the foregoing sources. The majority appear in the Dictionary of National Biography, and in sources listed in the British Biographical Index, but these accounts rarely record an involvement with the Cyclopædia. American edition The American edition was published by Samuel F. Bradford, of Philadelphia.(see :fr:Samuel F. Bradford). Bradford was a member of the famous family of American printers. The first volume appeared in May 1806 and the last in December 1820. The work extended to 41 volumes of text and 6 of plates. There were 1,851 subscribers recorded. The initial print run was set at 2,500 copies, but Bradford was beset by financial problems, and the project passed to Murray, Draper Fairman and Company who reduced the run to 2,000 copies. The work sold at $4 per half volume or $8 per volume. The full bound set cost $400 in 1820. The religious content of the first volumes was re-written to reflect American sensibilities by Bishop William White, an Episcopalian, and Ashbel Green a Presbyterian. Additional American material was incorporated into the text. References and sources References Chronological list of sources Anon, Dr Rees's New Cyclopædia – On Saturday, 2 January 1802, will be published..., 3 page printed prospectus, 1801 Anon, Dr