Long, high swells which have increased in height, almost to the breaking point, as they pass over shoals or run in shoaling water.



Related Terms

FIRST-ORDER LEVELING

Spirit leveling of high precision and accuracy in which lines are run first forward to the objective point and then backward to the starting point.

DERATING

The reduction of the rating of a device to improve reliability or to permit operation at high ambient temperatures.

CONCENTRIC TUBE COLUMN

A carefully insulated distillation apparatus which is capable of very high separating power, and in which the outer vapor-rising annulus of the column is concentric around an inner, bottom-discharging reflux return.

LOWER HIGH WATER

The lower of the two high waters of any tidal day.

RENDER CABLE

To apply the brake lightly so that when weight comes on the cable it will run out slowly.

IONOSPHERIC STORM

An ionospheric disturbance characterized by wide variations from normal in the state of the ionosphere, such as turbulence in the F-region, absorption increase, height increase, and ionization density decreases. The effects are most marked in high magnetic latitudes and are associated with abnormal solar activity.

VISCOSITY MODIFIER

Lubricant additive, usually a high molecular weight polymer, that reduces the tendency of an oil's viscosity to change with temperature.

DURATION OF FALL

Duration of rise is the interval from low water to high water, and duration of fall is the interval from high water to low water. Together they cover, on an average, a period of 12.4 2 hours for

SALT MARSH

A flat coastal area flooded by most high tides, characterized by various species of marsh grasses and animal life.

HIGHER HIGH WATER

The higher of the two high waters of any tidal day.

Related questions

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