Zerah Colburn from the office of ‘The Engineer’ asking for information regarding the construction of Richard Trevithick’s Merthyr Tydvil Engine (1804) for a large work on the locomotive engine which he is writing. ‘I believe no man deserves the same amount of credit as the inventor of the locomotive engine as the late Richard Trevithick’. (1 sheet/4pp.) With typed notes [late 1900s] by an unknown source.