On the sea floor, a small terrace

Related Terms

BENCH MARK

A fixed physical object used as reference for a vertical datum. A tidal bench mark is one near a tide station to which the tide staff and tidal datums are referred. A primary tidal bench mark is the principal (o

THWART

A bench seat across the width of an open boat.

TERRACE

On the sea floor, a relatively flat horizontal or gently inclined surface, sometimes long and narrow, which is bounded by a steeper ascending slope on one side and by a steeper descending slope on the opposite side.

TIDAL BENCH MARK STATE INDEX MAP

A state map which indicates the locations for which tidal datums and tidal bench mark descriptions are available.

TIDE STATION

The geographic location at which tidal observations are con- ducted. Also, the facilities used to make tidal observations. These may include a tide house, tide gage, tide staff, and tidal bench marks.

VERTICAL DATUM

A base elevation used as a reference from which to reckon heights or depths. It is called TIDAL DATUM when defined by a certain phase of the tide. Tidal datums are local datums and should not be extended into areas which have differing topographic features without substantiating measurements. In order that they may be recovered when needed, such datums are referenced to fixed points known as bench marks. See also CHART SOUNDING DATUM.

BENCH HOOK

Any device used on a carpenter's bench to keep work from moving toward the rear of the bench. Also known as side hook.

BENCH STOP

A bench hook which is used to fasten work in place, often by means of a screw.

BENCH ASSEMBLY

A technique of fitting and joining parts using a bench as a work surface.

BENCH PHOTOMETER

A device which uses an optical bench with the two light sources to be compared mounted one at each end; the comparison between the two illuminations is made by a device moved along the bench until matching brightnesses appear.

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