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.
Amgueddfa Cymru – Museum Wales
'Instructions for the Use of the Thornton-Gray Gas Detecting Lamp' and 'Charging Instructions for Type 4c Gray Sussman Miners' Lamp Accumulators'. Two pages, undated.
