Because electricity obtained from windmill generators is exempt from the Order prohibiting the use of power for advertisement lighting, workmen and engineers have been spending the weekend erecting four windmills on the 150 ft. high roof of the Cumberland Hotel, Marble Arch, London. These windmills will provide the electricity to illuminate the shop windows of the adjoining Corner House. As the propellor like blades are turned by the wind they charge ordinary car batteries wired up to a special lighting circuit. Tests have shown a 25mph wind to be sufficient to operate the generators. Photo shows the windmills being made ready for service on the roof of the Cumberland Hotel. In right background is the Park Lane area - 28th January 1951. 固opFoto