Educated at Eton College and Christ Church, Oxford and after serving as private secretary to the Prince of Wales, Tyrwhitt was elected MP for Okehampton in 1796. He was responsible for the construction of several roads across Dartmoor, a hamlet called Princetown named in honour of the Prince of Wales, a prison for prisoners of war captured during the Napoleonic Wars now HM Prison Dartmoor as well as the Plymouth and Dartmoor Railway. He was Auditor of the Duchy of Cornwall in 1796 and Lord Warden of the Stannaries in 1803. He was elected MP for Portarlington in 1802 and Plymouth in 1806. In retirement he became Gentleman Usher of the Black Rod. Google with the Archive Organization has sponsored the digitisation of books from several libraries. The Internet Archive makes available, in its Community Texts Collection (originally known as Open Source Books), books that have been digitised by Google from a number of libraries. These are books on which copyright has expired, and are available free for educational and research use. This rare book was produced from a copy held by the New York Public Library, and is available from the Internet Archive.