Report entitled "Damage to System by Bombs" describing 2 incidents (incident no. 15 and incident 97) where bombs were dropped by German planes during the Second World War in the Bethesda and Llanberis areas on 24 September 1940 and 6 March 1945. The reports were written by J. O. Williams (1892-1973) in his capacity as Electrical Engineer for N.W. Power Co., Llanberis (later known as Manweb). 1945