Directions:

Natural History Museum, the home of the original columbite sample studied by Hatchett, Cromwell Museum - N51 29.74 W0 10.54.
Science Museum, wealthy repository of archives, Exhibition Road - N51 29.86 W0 10.44.
Chemistry Department, Imperial College Road - N51 29.86 W0 10.66.
"1" = Queen's Tower, main landmark, Imperial College Road - N51 29.89 W0 10.61.
"2" = Library archives, rich source of information on Lockyer, Science Museum, etc., Imperial College Road - N51 29.89 W0 10.70.