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Head

The measure of the pressure of water expressed in feet of height of water1 psi = 2.31 feet of water. The measure of pressure at the base or other reference point of a column of fluid. Normally measured in feet of water. The product of the water's weight and a usable difference in elevation gives a measurement of the potential energy possessed by water.

Hold

Coil type indicating that a produced coil or lift has problems that need to be resolved by the Quality Assurance department. A method of stopping the normal disposition of a record, usually because of court cases or investigations. 2.An order status that prevents certain modification types and transactions from processing the order or order line until the hold is released.

Hold Down

A method of fastening sheet copper that involves the use of a brass screw with a large copper or brass washer. The screw is tightened sufficiently to keep the metal flat, but not restrict its lateral movement. The entire assembly is usually covered with a copper cap, fully soldered to provide watertightness.

Horrible and Detrimental

Hopelessly Deaf

Horse Dung