Each of the ranges and rocket firing test tracks were equipped with blast-proof observation post and a British Federation Concrete (BCF). The specification for the brick-built observation post with concrete roof to be built at Ynyslas is noted in memo from the Walton-on-the-Naze establishment and was to be suffcient to allow for up to 20 people to overlook the rocket's flight. It is believed that the BCF hus provided a covered working space for personnel to prepare observation instrumentation and collate initial results.
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