4223876
9781861267344
Old visual telegraphs - which used giant semaphore indicators located on a series of highly conspicious sites - were developed in France during the revolution. This book looks at the development of the telegraph on both sides of the channel, demonstrating how it saved British liberty when it was gravely threatened.Mallinson, Howard is the author of 'Send It by Semaphore The Old Telegraphs During the Wars With France', published 2005 under ISBN 9781861267344 and ISBN 1861267347.
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