This blackboard was preserved from Einstein's second lecture in Oxford, on 16 May 1931. Its equations connect the age, density and size of the Universe.
It is a sign of Einstein’s remarkable international fame that his chalked equations were not rubbed out at the end of the day. A blackboard should be the opposite of a permanent record, but instead this board was brought directly to the Museum, where it has been preserved ever since.
How it works
These short films bring to life a selection of working scientific instruments from the Museum's collection. All are on permanent display, but for conservation reasons would not normally be handled or demonstrated in public.