Used for sending messages to outside companies. Messages are transmitted via Western Union, ITT and RCA.Being replaced by fax and internet.


Related Terms

POLYFORMING

A noncatalytic, petroleum-refinery process charging C3 and C4 gases with naphtha or gas oil at high temperature to produce high-quality gasoline and fuel oil; mostly replaced by catalytic reforming; the prodTesting and Materials analysis of paraffins (P), olefins (O), naphthenes (N), and aromatics (A) in gasolines.

IMPULSE MODULATION

Modulation of a signal in which it is replaced by a series of impulses, equally spaced in time, whose strengths (integrals over time) are proportional to the amplitude of the signal at the time of the impulse.

HYDRAULIC CIRCUIT

A circuit whose operation is analogous to that of an electric circuit except that electric currents are replaced by currents of water or other fluids, as in a hydraulic control.

HUMPHREY GAS PUMP

A combined internal combustion engine and pump in which the metal piston has been replaced by a column of water.

DISPOSABLE

An element intended to be discarded and replaced after one service cycle.

CAUSTIC EMBRITTLEMENT

An obsolete term replaced by caustic cracking.

ERROR OF MEASUREMENT

The discrepancy between the result of the measurement and the true value of the quantity measured. NOTE 1: In general, 'true value' may be replaced by 'conventional true value'. NOTE 2: The discrepancy can be expressed as either: the algebraic difference between these two values, i.e. (error of measurement) = (result of measurement) - (true value), or as the quotient of that difference and the value of the quantity measured. These two forms of expression are often identified as 'absolute error' and 'relative error' respectively.

LIGHTSHIP

A permanently anchored vessel performing the functions of a lighthouse, typically in a location where construction of the latter is impractical. These have largely been replaced by buoys or, as construction techniques have improved, actual lighthouses.

OCEAN CARRIER

Diesel-fueled vessels have replaced the old steamships of the past, although many people still refer to modern diesel ships as steamships. Likewise, the person who represents the ship in port is still often called a steamship agent. (S

NAVY NAVIGATION SATELLITE SYSTEM

A satellite navigation system of the United States conceived and developed by the Applied Physics Laboratory of the Johns Hopkins University. It is an all-weather, worldwide, and passive system which provides two-dimensional positioning from low-altitude satellites in near-polar orbits. The Transit launch program ended in 1988, and the system is scheduled for termination in 1996, replaced by GPS.

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