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John Hannavy is a writer and photographer with a passion for engineering history. His work regularly appears in heritage magazines. A retired academic, he has written extensively on railways and other forms of transport, steam-powered machines, the history of photography, and the industrial development of Victorian and Edwardian Britain. His previous books Transporter Bridges – an illustrated history and The Governor – controlling the power of steam machines, are both also published by Pen & Sword.