as he desires, through the action of the springs.

[Illustration: FIG. 10.--MOUGIN'S HYDRAULIC GUN CARRIAGE.]

For high aiming, the gun and the movable part of its carriage are
capable of revolving around a strong pin, c, so placed that the axis of
the piece always passes very near the center of the embrasure, thus
permitting of giving the latter minimum dimensions. The chamber of the 8
inch pump is provided with projections that slide between circular
guides, and carries the strap of a small hydraulic piston, p, that
suffices to move the entire affair in a vertical plane, the gun and
movable carriage being balanced by a counterpoise, q.

The projectiles are hoisted to the breech of the gun by a crane.

Between the outer armor and turret sufficient space is left for a man to
enter, in order to make repairs when necessary.

Each of the rolled iron plates of which the turret consists weighs 19
tons. The cupolas that we have examined in this article have been
constructed on the hypothesis than an enemy will not be able to bring
into the field guns of much greater caliber than 6 inches.--_Le Genie
Civil_.

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HIGH SPEED ON THE OCEAN.