Power without control is unusable power, and long after the invention of the steam engine, finding ways of applying that power to tasks where consistency was of paramount importance was the 'Holy Grail' which many steam engineers sought to find. The best known of them was Greenock-born James Watt, whose name is forever associated with the story of steam power, although his achievements drew heavily on the innovations of others. The Governor explores the history and development of the centrifugal governor and its role in accelerating the Industrial Revolution. It was the centrifugal governor which brought precision to the application of steam power, and its story can be traced back to 17th century Holland and Christiaan Huygens' development of both the pendulum clock and system controls for windmills. Publication of the 144-page book, illustrated with modern photographs, historic plans and contemporary illustrations, is anticipated in 2020.
The Victorian Photographs of Dr. Thomas Keith and John Forbes White is still available from John Hannavy Publishing price £20.00 + P&P.
To order a copy, use the Contacts page.
Published by PiXZ/Halsgrove in October 2017, price £9.99, is Edwardian Railways in Postcards a celebration both of the railways themselves and of the art of the postcard photographers, colourists and publishers. Click on the book cover, below to log on to Amazon.co.uk where you can see all of John Hannavy's currently available books.