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694 triangulation • Trinitron
Gate
triac
map, drawn emanating from the transmitter
locations 180 degrees opposite their respective
bearings.
Triax A double-shielded coaxial cable. A center
conductor is surrounded by two concentric, independent
shield conductors.
triaxial connector A male or female connector
having three concentric contacting surfaces. By
contrast, the coaxial jack and coaxial plug have
only two such surfaces.
triaxial speaker A dynamic loudspeaker containing
three coils and three cones, for high-,
low-, and middle-frequency ranges. It is, in effect,
three speakers in one. It is commonly used in
high-fidelity music reproduction systems. Also
called triaxial driver. Compare THREE-WAY
SPEAKER.
triboelectric Pertaining to frictional electricity.
triboelectric series See ELECTROSTATIC SE-
RIES.
triboluminescence Luminescence produced by
means of friction.
trickle charge A continuous slow charge of a storage
battery, in which the charging rate is just sufficient
to compensate for internal losses or
normal discharge.
trickle charger A light-duty unit for charging a
battery gradually at low current.
tricorner reflector A device that reflects a ray of
incident energy at a 180-degree angle, regardless
of the direction from which the ray approaches.
Thus, the ray will return to its source,
unless some obstruction intervenes. It consists
of three mutually perpendicular reflecting plane
surfaces that intersect in a common point. The
geometry is identical to that in a typical room,
where the ceiling meets two walls. It is useful at
microwave, infrared, visible, and ultraviolet
wavelengths.
triethanolamine An amino alcohol that precipitates
metallic silver from a silver-nitrate solution
in the deposition of a silver surface on a substrate,
such as glass or a ceramic.
trig Abbreviation of TRIGONOMETRY.
trigatron A form of electrically operated switch.
The circuit is closed by the breakdown of an electrical
gap.
A 2
A 1
trigger 1. A pulse used to start or stop the operation
of a circuit or device, such as a flip-flop. 2. To
place a circuit or device into or out of operation
with a start or stop pulse, as defined in 1.
trigger diode See DIAC and FOUR-LAYER DIODE.
triggered multivibrator See DRIVEN MULTIVI-
BRATOR.
triggered sweep In an oscilloscope or similar device,
a driven sweep.
triggering point The voltage level at which the action
of an electronic switching device is initiated.
Also see BREAKOVER POINT.
trigistor A three-junction semiconductor device
that exhibits two-state operation, and is useful as
a flip-flop or switch. Also see NPNP DEVICE.
trigonometric functions See CIRCULAR FUNC-
TIONS and HYPERBOLIC FUNCTIONS.
trigonometry The branch of mathematics devoted
to the application of CIRCULAR FUNCTIONS in a
plane. It is useful in electronics for determining
impedance and phase.
trim To make a fine adjustment, as of a tuning
control, balance control, output adjustment, etc.
trimmer A low-valued variable capacitor, inductor,
or resistor operated in conjunction with a main
unit (usually of the same sort) for vernier
adjustment or range setting. See, for example,
HIGH-FREQUENCY TRIMMER and OSCILLATOR
TRIMMER.
trimmer capacitor
trimmer.
Mounting
contact
A variable capacitor used as a
Adjustable screw
Porcelain
base
trimmer capacitor
Dielectric
Mounting
contact
trimmer coil See TRIMMER INDUCTOR.
trimmer inductor A variable inductor used as a
trimmer.
trimmer resistor A variable resistor used as a
trimmer.
trinary number system The base-3 system of notation.
This system uses the digits 0, 1, and 2, the
positional values being successive powers of 3
(e.g., decimal 14 equals trinary 112). Also called
ternary number system.
Trinitron 1. A single-gun color-television picture
tube developed by Sony. 2. A television set using