straits and harbors, globular batteries would be much less expensive than costly land fortifications, and more efficient, because so much. nearer to attacking vessels.

The roll of the Trident in a gale would be very slight. The stability of buoys of a similar shape is well known. By the use of additional fixed ballast in bottom, the center of gravity can be placed farther below the metacenter.

Iron coal bulkheads and strong iron plates under beams above water tanks make practically a small vessel inside a larger one. These provisions, combined with the double cellular construction above base and also in the coal and water ballast tanks, together with the coal, afford a defense against torpedoes, and a net could be arranged to hang around the submerged hull and could be armed with small torpedoes to destroy attacking torpedoes without affecting the Trident. The boilers and machinery are particularly well protected. The doors to barbettes are protected by the armored central tower, tons, have 11.4-inch armor on belt and 6- to 8-inch on side, and have no gun heavier than 12.8-inch, and cost $7,500,000 each.

The largest British battle-ship, King Edward VII, 16,350 tons, has 9-inch armor on belt, 8-inch on side, carries 950 tons of coal, and has no gun heavier than 12-inch, and cost £1,426,266 sterling.

the doors to which are protected by the barbettes. The upper deck and the tops of tower and barbettes have three-inch armor.

If preferred, the guns on upper deck may be in turrets instead of in barbettes. Some additional guns may be placed on upper deck and on gun-deck. Some of the eight-inch or smaller guns on gun-deck may be put in barbettes.

There is large opportunity for torpedo tubes. Smaller steam power than that shown would be sufficient for coast defense. The purpose of the globular battery is coast defense rather than foreign conquest.

Launches and boats may be carried on gundeck under protection of the armor.

One or two pillars on gun-deck may be moved a little or made removable, to facilitate entrance of large boats and guns.

The number of gratings may be increased. A sail may be used to keep head to wind when at anchor.

A bilge-keel and a rudder may be added.

On vertical section the radius of hull above water-line may be increased if desired, reducing freeboard and increasing positive G. M. and making sides more slanting.

The globular battery may be used also as :

Lightship.

Station for telephone and for marine and wireless telegraph.

Time-ball station.

Supply depot for medicines, stores, water, coal, equipment, etc.

News depot and post-office.

Pilot station.

Station for doctor.

Station for instrument maker, for adjustment of chronometers, compasses, and other instruments.

Stationary troop-ship off an unhealthy port. Coast wrecking station, etc., etc.