Frank Sherwood Taylor was director of the Science Museum London for just over five years from October 1950. He was the only historian of science ever to have been director of this institution, which has always ridden a tightrope between advocacy of science and advocacy of its history, balancing differently at different points in its history. He was also president of the BSHS from 1951 to 1953. So what happened when a historian got his hands on the nation's pre-eminent public (...) museum of science? To what extent did his historian's training and instincts affect his policies whilst director, and with what effect in the longer term? Taking this exceptional case, I suggest, enables us to consider how museum accounts of the past of science relate to historiographies of science otherwise available in the culture. In this discussion, drawing on new archival research, I consider the role of history within a key policy paper he wrote in 1951. I analyse and contextualize its main themes before considering, by way of conclusion, his legacy. (shrink)