Here are the members of the Black Hill post of a unit which started the Second World War as the Observer Corps but which gained the prefix "Royal" in 1941.
The photograph was donated to the Keighley archives by the late Eric Binns, one of two full-time Observers at Black Hill, who also wrote down his memories.
"We often had to dig our way in and out of the post through drifts of snow," he recalled, "And when you were on duty from 10pm to 10am it was pretty rough going at times."
The Black Hill post was manned 24-hours a day for the duration of the war, Observer volunteers serving 12 hours a week to fulfil a rota whereby at least two were on duty at any one time.
Their basic purpose was to recognise and track aircraft and relay information to headquarters. By the end of the war an experienced Observer could quickly identify up to 140 different types.
Late in 1944, a V1 missile passed over the Black Hill post. "The engine stopped," the head Observer recorded an anxious moment. "We thought the bomb was coming down." But it continued to Sowerby Bridge.
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