A letter to Richard Trevithick from Davies Giddy regarding Trevithick's results from his first trial of the Herland pole steam engine
A letter to Richard Trevithick from Davies Giddy regarding steam engine velocity
A letter to Richard Trevithick from Davies Giddy regarding steam engines
A letter from Davies Giddy advising Richard Trevithick on his future course of action following the failure of a claim for government assistance
A reply letter to Richard Trevithick from Davies Giddy since Trevithick's return to England; answers his enquiry about performance figures for early Cornish engines
A letter to Richard Trevithick from Davies Giddy regarding steam engine velocity
A letter to Richard Trevithick from Davies Giddy regarding arrangement of boiler tubes in Trevithick's Herland Mine engine
A letter to Richard Trevithick from Davies Giddy regarding calculations associated with steam engines
