He also wrote on a wide range of topics, contributing to encyclopaedias of the day. Later in his life, he attempted to construct a calculating machine. He was also interested in optics and a paper on how the kaleidoscope could be improved. This formed the basis of slide rules that were common currency in schools and universities until the age of the calculator. In 1814, he invented a slide rule to calculate the roots and powers of numbers. He was made a fellow of the Royal Society and from 1827 to 1848 served as its secretary. In 1808, he moved to London and continued to lecture on medical topics. Roget worked in Bristol and in Manchester and for a time was a private tutor, travelling with his charges to Europe. As a young doctor he published works on tuberculosis and on the effects of nitrous oxide, known as 'laughing gas', then used as an anaesthetic. He studied medicine at Edinburgh University and graduated in 1798. Peter Mark Roget was born on 18 January 1779 in London, the son of a Swiss clergyman. © Roget was an English doctor, writer and inventor, but today is best known for his 'thesaurus'.
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