Letter from Michael Williams (MP for Cornwall) giving his recollections of Richard Trevithick’s work on steam engines in the Cornish mines and his first trial of the road steam carriage. ‘...in reference to his great improvements in the steam engine I have a more particular recollection and can confidently affirm that he was the first to introduce a high pressure principle of working...’ (1 sheet/4pp.)

With typed notes [late 1900s] from an unknown source.