Includes extracts from ‘Who Invented the Locomotive Engine’ by Oswald Dodd & Hedley, London; Daniel Kinnear Clark C, Railway Machinery dedicated to Robert Stephenson, Published by Blackie & Son 1855; Nicholas Wood's treatise 1825, various pages; ‘Data on Gas’ by Mr Smith, 1880; and a list of authors writing on the locomotive &c; general notes, some sketches.