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.
Hand drawn in black ink on grey paper. A technical drawing showing annealing pans with cambered sides and concave bottom. Dated January 24th, 1925 and signed 'T.N.B.'
