These cookies are absolutely essential for our website to function properly.
We use Google Analytics to measure how you use the website so we can improve it based on user needs.
These cookies may be set by third party websites and do things like measure how you view YouTube videos.
Handwritten in pencil on off-white, blue ruled paper. Notes and calculations relating to the Cefn Coed Colliery steam consumption and storage. The notes one side are dated 21-11-33 and the notes on the other side are dated 27-6-32. Loose within a green card file with all other documents with accession number 83.184I/67. The file is labelled 'Colliery Boiler Plant B31', 'Cefn Coed Data' and 'Colliery Engineering'.
