Laurie worked in the Solar Department at the Royal Observatory, Greenwich, which remained open throughout the Second World War. This section includes two wartime diaries kept by Laurie, along with photocopies and a related article. There are two second world war files: one comprised of war-era circulars, notices, and ration lists etc.; the other comprised of bomb damage reports for the ROG. There is also a handwritten 'Klaxon warning' notice giving orders for dome watchers in the event of flying bombs.

The section also includes a First World War file on the work of the ROG in the cleaning and adjustment of binoculars as part of the war effort.