Two-cylinder opposed Avro Aero engine, complete with airscrew, manufactured by A.V. Roe & Co., patented by Maurice and William Edwards, 1910. Believed to have originated from Lillian Bland's Mayfly aircraft. Two-cylinder opposed Avro Aero engine, with airscrew 1911
(1) Avro 504K biplane D7560 with 130hp Clerget engine no. 52090; (2) Aeroplane Log Book; ( 3) Engine Log Book; and (4) 30 hour non-luminous Mk.V watch Avro 504K biplane D7560 with 130hp Clerget engine, c 1917. 1917
Relay Demonstration Computer, c1963, with two circuit diagrams - detailed operators instruction - explanation of internal operations Roe relay demonstration computer 1963