mortar-vessel

If points are not visible in line, then measure a base on shore, angle on the object to be aimed at, and from the angles of the base-line, you can fix the position of the mortar-vessel.

Ordnance Instructions for the United States Navy. 1866. Fourth edition. United States. Navy Dept. Bureau of Ordnance

Gambier finally despatched a single mortar-vessel in to bombard the stranded ships, but by this time Cochrane had become desperate.

Deeds that Won the Empire Historic Battle Scenes 1886

April he despatched the brigs and mortar-vessel to attack the ships still aground.

How Britannia Came to Rule the Waves Updated to 1900 William Henry Giles Kingston 1847

The fire-ships were ready, but one mortar-vessel, the _Etna_, alone had arrived.

How Britannia Came to Rule the Waves Updated to 1900 William Henry Giles Kingston 1847