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A square head and steel rule that when used together have both a 45 and 90 face to allow the testing of the accuracy of two surfaces intended to have these angles.

Related Terms

PSID

pounds per square inch differential.

HEADLAND

A comparatively high promontory having a steep face. Usually called HEAD when coupled with a specific name. Also called FORELAND.

PSIG

pounds per square inch gauge (PSIA - 14.696).

ATMOSPHERIC PRESSURE

Pressure exerted by the atmosphere at any specific location. (Sea level pressure is approximately 14.7 pounds per square inch absolute.)

psia

pounds per square inch absolute.

psi

pounds per square inch.

ICE ISLAND

A large piece of floating ice showing about 5 meters above the sea surface, which has broken away from an ice shelf, having a thickness of 30 to 50 meters and an area of from a few thousand square meters to l50 square nautical miles or more; usually characterized by a regularly undulating surface which gives it a ribbed appearance from the air.

MOMENT OF INERTIA

The quantity obtained by multiplying the mass of each small part of a body by the square of its distance from an axis, and adding all the results.

DYNAMIC SUCTION HEAD

Positive static suction head minus friction head and minus velocity head.

SUCTION LIFT

The combination of static suction lift and friction head in the suction piping when the source of liquid is below the pump centerline.
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