A pneumatic percussive drill designed as a boring tool.

A type of insulation made from virgin basalt, an igneous rock, and spun into loose fill or a batt. It is fire resistant and helps with soundproofing.

The upward curvature of the keel towards the bow and stern.

A rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

A high-altitude sounding system consisting of a small solid- propellant research rocket carried aloft by a large plastic balloon. The rocket is fired near the maximum altitude of the balloon flight.

Rate Of Exchange.

Installations character for RAdio Installations.

Seaman's name for a reef knot tied upside down. also called a "granny" knot.

The alternating motion of a boat, leaning alternately to port and starboard; the motion of a boat about its fore-and-aft axis.

To re-book cargo to a later vessel.

A method of storing a sail, e.g., by rolling the jib around the headstay.

A system of reefing a sail by partially furling it. Roller furling systems are not necessarily designed to support roller reefing.

The side-to-side (athwartship) motion of a vessel.

A type of journal bearing in centrifugal air compressors.

- A hitch used for bending a line to a spar, which if tied properly, won't slip. The end of the line is passed around the spar and then passed a second time around so it rides over the standing part. Then it is carried across and up through the bight.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

A building element that provides protection against the sun, wind, and precipitation.

A solar energy collection device consisting of containers of water located on a roof that absorb solar energy during the day so that the heat can be used at night or that cools a building by evaporation at night.

A stationary or rotating vent used to ventilate attics or cathedral ceilings; usually made of galvanized steel, or polypropylene.

The navigable water to leeward of a vessel.