HMS 'Monarch' engines, 1868.
© Science Museum / Science & Society Picture Library
Model of engines (scale 1:8) from the 'Monarch', which was the first seagoing turret ship. Built at Chatham, Kent, the ship displaced 8320 tons. She was renamed 'Simoon' in 1904. The model represents 'Monarch's' original engines, a horizontal, twin-cylinder, return connecting-rod set constructed by Humphrys and Tennant. These engines indicated 7800hp, at 64 revs per minute, giving the vesel a speed of 14.9 knots, making it the fastest ship of its day. In 1885 the 'Monarch' broke down at sea and had to be towed to Malta for repairs.