A metal appliance consisting of a thread and screw capable of being set up or slacked back and used for setting up on rigging.

A buoyant balloon rising freely in the atmosphere, as opposed to a captive balloon.

Board that holds graph paper on which is plotted information obtained from a pilot-balloon observation.

The prevailing or average weather conditions of a geographic region.

A type of heating appliance that extracts so much of the available heat content from a combusted fuel that the moisture in the combustion gases condenses before it leaves the furnace. Also this furnace circulates a liquid to cool the furnace's heat exchan ...

A running light allowed on some sailboats instead of the normal bow and stern lights. The tricolor light contains the red and green side lights and the white stern light in a single fitting that is attached to the top of the mast.

A bond which does not record its owner's name. Possession of the bond certificate is therefore the.

Corrosion that proceeds laterally from the sites of initiation along planes parallel to the surface, generally at grain boundaries, forming corrosion products that force metal away from the body of the material, giving rise to a layered appearance.

See hydrogen embrittlement.

By international agreement, a period during which greatly increased observation of world-wide geophysical phenomena is undertaken through the co-operative effort of participating nations. July 1957-December 1958 was the first such year. However, precedent ...

Two short pieces of timber fixed horizontally fore and aft on each side of the lower masthead of a square rigged vessel and used to support the topmast, the lower crosstrees, and the top.

The atmospheric pressure computed using station elevation as the reference datum level. Station pressure is usually the base value from which sea level pressure and altimeter setting are determined.

The time required for an instrument to registe 63.2% of a step change in the variable being measured.

A stated amount over a fixed rate to one point to make a rate to another point.

The post that the rudder is attached to. The wheel or tiller is connected to the rudder post.

Break; e.g., the line parted under strain

A person who commits to guarantee the debts of another. For example if an individual fails to meet.

The low effective temperature of the sky on a clear night.

To change the course of a sailing vessel.

In wooden ship construction, these were cylindrical pins of oak which were used to secure the planks to her timbers. Pronounced "trennels".