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376 international henry • interpreter
international henry A unit of inductance, equal to
1.00018 absolute henry.
international joule A unit of energy, equal to
1.00018 absolute joule.
International Morse Code See CONTINENTAL
CODE.
international ohm A unit of electrical resistance,
equal to 1.000495 absolute ohm. The other international
units are derived from this value.
International Radio Consultative Committee
Abbreviation, CCIR (Comite Consultatif International
Radiodiffusion). An international organization
reporting to the International
Telecommunication Union, and studying technical
operations and tariffs of radio and television.
International Steam Table calorie A unit of heat
energy equal to 4.1868 joules.
International System of Units Abbreviation, SI
(Systeme International d’Unites). The system of
units of measurement established in 1960 under
the Treaty of the Meter. The base units are as follows.
–METER (m), length: 1,650,763.73 times the
wavelength of the light emitted in a vacuum of
krypton 86
–KILOGRAM (kg), mass: the mass of the protype
kilogram kept at Sevres, France
–SECOND (s), time: the duration of
9,192,631,770 periods of the radiation that corresponds
to the transition between the two hyperfine
levels of the ground state of cesium 133
–KELVIN (K), thermodynamic temperature: 1 ⁄273.16
the thermodynamic temperature of the triple
point of water
–AMPERE (A), electric current: the current that,
flowing through two infinitely long parallel wires
in a vacuum and separated by 1 meter, produces
a force of 2 × 10 –7 newton per meter of
length between the wires
–CANDELA (cd), luminous intensity: the luminous
intensity of 1 ⁄600,000 square meter of perfectly
radiating surface at the temperature of freezing
platinum
International Telecommunication Union Abbreviation,
ITU. An international, nongovernmental
organization devoted to standardizing worldwide
communications practices and procedures.
International Telegraph and Telephone Consultative
Committee See CCITT.
International Telegraph Consultative Committee
See CCIT.
international units A system of electrical units,
based on the resistance through a specified
quantity and configuration of the element mercury.
The INTERNATIONAL OHM forms the basis
for the international system of units.
international volt A unit of electrical potential,
equal to 1.00033 absolute volt.
international watt A unit of power, equal to
1.00018 absolute watt.
Internet A worldwide, interconnected system of
computer networks. Originated in the late 1960s
as ARPAnet (Advanced Research Projects Agency
network). Still used extensively by educators and
scientists, but gaining popularity among
personal-computer users. Sometimes called
the INFORMATION SUPERHIGHWAY.
interphone An intercom aboard a mobile vehicle.
interpolation Finding a value that falls between
two values listed in a table, indicated by a dial,
plotted on a graph, derived by estimate, or given
by intermediate calculation. For example, if a linear
variable capacitor has a value of 100 pF when
its dial is set to 10, and 140 pF when the dial is
set to 20, then the capacitance when the dial
reads 15 (midway between 10 and 20) can be assumed
to be 120 pF (midway between 100 pF and
140 pF). When functions are not linear, interpolation
is usually not exact.
Estimated
point
A
C
B
D
E
interpolation
F
A—F:
known points
interpolation meter See INTERPOLATION-TYPE
INSTRUMENT.
interpolation oscillator A frequency-measuring
signal generator with a built-in crystal oscillator,
whose harmonics provide calibration points on
the tuning dial. The dial provides a continuous
indication of generator frequencies between crystal-harmonic
points. Also see INTERPOLATION-
TYPE INSTRUMENT.
interpolation-type instrument An instrument,
such as a meter or signal generator, that is used
to transfer an accurate quantity point from a
standard to another instrument and to provide a
range of values between such points. A secondary
standard is sometimes used as an interpolationtype
instrument (see, for example, INTERPOLA-
TION OSCILLATOR).
interpole motor A direct-current motor with small
auxiliary poles (interpoles) between its main field
poles. The interpoles reduce sparking at the commutator.
interpreter A computer program that can convert
instructions given in a high-level language (BA-
SIC, for example) into the machine language that