ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Bidston Hill Observatory and Lighthouse. Postcard of the observatory (left, 1866) and lighthouse (1873) erected at Bidston Hill, on the Wirral Peninsula, near Birkenhead, UK. One of the main functions of the observatory was to provide a precise daily time measurement, as well as weather forecasts. Such time measurements were usually provided in the form of the dropping of a time ball, but as the observatory was several kilometres from the Port of Liverpool, whose maritime interests it served, the time of 1 o'clock was marked daily with the firing of a cannon. The lighthouse was in use until 1913.
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