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The highest point on the internal bottom surface of the crown of a plumbing trap.



Related Terms

INTERNAL BRAKE

A friction brake in which an internal shoe follows the inner surface of the rotating brake drum, wedging itself between the drum and the point at which it is anchored; used in motor vehicles.

HOVE IN SIGHT

When an anchor is hove home, it is sighted and clear' at the point when the anchor crown shackle breaks the surface of the water.

BOTTOM SHAPE

As it affects performance in a planing boat. Maximum speed will be achieved when the bottom of the boat that forms the planing surface is flat. When the planing surface is a vee, the boat will have a softer ride but less potential speed, and will take longer to come up on a plane. A "flat bottom" makes a better "drag" boat; a deep vee will be a better rough water boat.

BATTED WORK

A hand-dressed stone surface scored from top to bottom in narrow parallel strokes (usually 8 10 per inch or 20 25 per centimeter) by use of a batting tool.

ECHO SOUNDER

An instrument used to determine water depth by measuring the time interval for sound waves to go from a source of sound near the surface to the bottom and back again. Also called DEPTH FINDER, ACOUSTIC DEPTH FINDER.

LEVEL MEASUREMENT

The determination of the linear vertical distance between a reference point or datum plane and the surface of a liquid or the top of a pile of divided solid.

HOLE INJECTION

The production of holes in an n-type semiconductor when voltage is applied to a sharp metal point in contact with the surface of the material.

ELECTRIC POTENTIAL

The work which must be done against electric forces to bring a unit charge from a reference point to the point in question; the reference point is located at an infinite distance, or, for practical purposes, at the surface of the earth or some other large conductor. Also known as electrostatic potential; potential. Abbreviated V.

ANGLE OF IMPACT

The acute angle between the tangent to the trajectory at the point of impact of a projectile and the plane tangent to the surface of the ground or target at the point of impact.

FROST-POINT HYGROMETER

An instrument for measuring the frost point of the atmosphere; air under test is passed continuously across a polished surface whose temperature is adjusted so that a thin deposit of frost is formed which is in equilibrium with the air.

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