The publication of the London Encyclopaedia, or Universal Dictionary of Science, Art, Literature and Practical Mechanics: comprising a Popular View of the Present State of Knowledge was begun by London-based bookseller and publisher Thomas Tegg in 1825. It may be found in two original editions of 22 volumes, published 1829 and 1839, as well as more recent reprints. Thomas Tegg describes the project as follows in The Publisher's Address placed into another of his publications in 1828: