Electricity on Board Ships
By S. Dana Greene
The modern first-class battleship requires about 2000 indicated horsepower to drive all the auxiliaries at full load, and the first-class cruiser about 1200 indicated horse-power. These auxiliaries, however, are never all in use at the same time, using maximum power, and it can be assumed that about one-half these amounts (i.e., 1000 indicated horse-power and 600 indicated horse-power) will be required at one time. They are scattered all over the ship, from the anchor hoist forward to the steering engine aft, and from the deck winches and boat cranes on the spar deck to the bilge and fire pumps in the engine- and fire-rooms, 30 or 40 feet below. Some of them, such as condenser, air, circulating, feed, bilge, and fire pumps and fire-room blowers, are necessarily located within the engine- and boiler-room compartments, where the temperatures are always high, and where steam, oil, water and coal-dust are always present in greater or less quantities. Others, located on the spar deck, are exposed to salt water and air and to the varying conditions of sea and weather.