The 2,640 ton Torpedo Ram HMS Polyphemus was built in 1891/92 she had shallow-draft, fast, low-profile vessel, and was designed to penetrate enemy harbours at speed and sink anchored ships. She had a top speed of 17 knots, which was very fast for the time, to ram and sink or badly damage ships at anchor and make a quick escape.
Designed by Nathaniel Barnaby primarily as a protected torpedo boat, the ram was provided very much as secondary armament.
Even with a shallow draft of 20ft and 6inches Polyphemus was capable of making a passage in any weather from Plymouth to Gibraltar, or from Gibraltar to Malta at 10 knots without assistance. With a ships complement of 80, she was armed with 5 × 14-inch torpedo tubes and 6 × 1-inch Nordenfelt guns. One torpedo tube ran down the center of the ram. To help with manoeuvring in tight places she had bow rudders also on the ram. She was also the first Royal Navy vessel to be fitted with 80-volt electric lighting. This was adopted by the Royal Navy in 1882 following a fatal electrocution aboard HMS Inflexible, which had an 800-volt circuit.
It has been suggested that H. G. Wells’ fictional HMS Thunder Child from his novel The War of the Worlds may have been based on this ship, in part because he described Thunder Child as an ironclad torpedo ram. When Martian invaders attack an evacuee packed ship, the ship goes to their rescue. During the intervention, the Thunder Child sacrifices herself to enable the refugee ship to escape but succeeds in destroying two alien tripods.
Despite being a successful ship, no further vessels of this design were ordered by the Royal Navy, possibly because the development of much more sophisticated ships with traversing gun turrets, rendered the design of this ship obsolete. And so, Polyphemus was the only ship of this type which the Royal Navy possessed.
The wonderful names that the British came up for their ships, shows their affinity to the classical period. Polyphemus appears in The Odyssey of Greek mythology as a Cyclops, the son of the Greek Poseidon (equivalent to the Roman Neptune), the trident bearing sea god.









