Includes: scheme of passive defence for the ROG describing the organisation of personnel and proposals for the protection of personnel, buildings, instruments, chronometers, records and stores; list of applications for great coats and boots, 3 September 1940; notice on the duties of a sentry; lists of Home Guard duties; target practice card for H.W. Newton; target engagement form for the Home Guard; record of firing at Bisley, 22 August 1940; correspondence with the Astronomer Royal concerning accommodation for the Home Guard; various instruction sheets, including notices re first aid and decontamination, and recommendations on the conservation of water during air raids; circulars concerning allowances for fire watching duties; rotas for A.R.P. (Air Raid precaution) and fire fighting duties at the ROG; tea, milk and sugar ration lists (including some on re-used Solar Department observation forms from 1936); a request for recreational leave by the A.R.P. personnel, 29 April 1941; various circulars re annual leave and attendance; Nore Air Raid Defence Orders on fire and gas attacks; notice from the Astronomer Royal on identifying and reporting the use of gas by the enemy; memorandum on opening windows to limit damage from flying bombs; Nore Air Raid Defence memorandum on the possible modification of the I.B.E.N. by Germany; notice of the discontinuation of the National Air Raid Warning system by the Metropolitan Police, 2 May 1945.