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# CROWN WEIR

 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.

### Related questions

MarineProHelp 2018 - 2020

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