18WuD2x

312 gauze resistor • general class license
Probability
Geiger counter A radioactivity rate-counting instrument
based on the GEIGER-MUELLER
TUBE. Pulses from the tube drive a transistor,
which, in turn, drives a meter or digital counter to
indicate the count.
Trigger 8 range
Parameter
M
edian
G-M
tube
Detector
voltage
supply
Meter
Gaussian distribution
gauze resistor See WOVEN RESISTOR.
GAVRS Abbreviation of gyrocompass attitude vertical
reference system.
GCA Abbreviation of GROUND-CONTROLLED
APPROACH.
GCI Abbreviation of GROUND-CONTROLLED
INTERCEPTION.
GCM Abbreviation of gyrocompass module. See
GYROCOMPASS.
GCT Abbreviation of GREENWICH CIVIL TIME.
Gd Symbol for GADOLINIUM.
G display See G SCAN.
GDO 1. Abbreviation of GRID-DIP OSCILLATOR.
2. Abbreviation of GATE-DIP OSCILLATOR.
Ge Symbol for GERMANIUM.
gear 1. Collectively, electronic equipment. 2. A
toothed wheel commonly used in mechanical devices.
gearmotor An electric motor with a gear train for
speed changing.
gear-wheel pattern A pattern produced on an oscilloscope
by intensity-modulating a circular
trace. A signal of unknown frequency f x is applied
to the intensity-modulation (z-axis) input. The
signal produces corrugations in the trace. If there
are n corrugations around the trace, and if the
trace itself completes f s revolutions per second,
then the unknown frequency f x , in Hz, is equal to
nf s . Compare SPOT-WHEEL PATTERN.
f x = nf s
gear-wheel pattern
Geiger counter
Geiger-Mueller counter See GEIGER COUNTER.
Geiger-Mueller region For a GEIGER-MUELLER
TUBE, the range of voltages within which the output
pulse amplitude is constant, regardless of
ionizing radiation intensity.
Geiger-Mueller threshold The lowest voltage in
the Geiger-Mueller region.
Geiger-Mueller tube A gas-filled radiation detector/counter
tube consisting of a straight wire as
an anode, surrounded by a cylindrical cathode.
The tube is biased by high voltage. Radiation penetrating
the tube ionizes the gas; each ionizing
event causes an output pulse.
Geiger point counter See POINT COUNTER.
Geiger region See GEIGER-MUELLER REGION.
Geiger threshold See GEIGER-MUELLER THRES-
HOLD.
Geissler tube A simple gas-filled glow-discharge
tube with metal electrodes sealed in each end.
When a sufficiently high voltage is applied between
the electrodes, the highly rarefied gas ionizes
and glows with the color associated with the
particular gas used.
gel A substance equivalent to colloidal solution in
the solid phase (e.g., silica gel).
gel battery A rechargeable electrochemical BAT-
TERY designed for use with portable electronic
and computer equipment. Noted for its ability to
deliver high current for short periods, when necessary,
and also to deliver moderate current continuously
throughout its discharge cycle.
gen Abbreviation of GENERATOR.
genemotor Contraction of generator/motor, a
(usually battery-driven) dynamotor that has separate
motor and generator windings on the same
armature core.
general class license An amateur-radio license
that conveys some privileges in the highfrequency
bands, and all operating privileges in
the very-high-frequency region and above. An examination
of moderate difficulty is required.