The Monitor of the Civil War. E-book. Formato PDF David R. Ellis   -  Forgotten Books, 2017  - 

The system of mounting heavy guns in revolving tur rets was advocated at quite an early date in England. Captain Cowper Cowles, in 1860, after his expenences in the Crimean war, advised the British Government to con vert a few of her men-of-war into turreted battleships.