18WuD2x

760 xerography • X-ray photograph
image of the material to be copied. A latent image
is formed on the surface and is developed (by
dusting with black powder attracted to the
charged image) to make the image visible.
xeroradiography Xerography using X RAYS.
xerothermic A condition characterized by both
heat and dryness.
Xerox 1. Name of a company that manufactures a
wide variety of office and computer equipment.
2. Trade name for a XEROGRAPHY machine.
3. The reproduction obtained by means of
XEROGRAPHY (generic term). 4. To make a
xerographic reproduction (generic term).
X factor 1. An unknown or unidentifiable quantity
or parameter. 2. See X COMPONENT.
xformer Abbreviation of TRANSFORMER.
X gain The gain (or gain control) of the horizontal
channel of an oscilloscope or X-Y recorder. Compare
Y GAIN and Z GAIN.
X-H array See LAZY-H ANTENNA.
XHV Abbreviation of EXTREMELY HIGH VACUUM.
x intercept The x coordinate of the point at which
a line or plane intersects the X-AXIS.
x irradiate To expose to X RAYS.
xistor Abbreviation of TRANSISTOR.
X L Symbol for INDUCTIVE REACTANCE.
X line A horizontal line in a memory matrix. Compare
Y LINE.
XLR connector A microphone connector with a
locking device to prevent unintentional disconnection.
It has three pins and is commonly used
with balanced audio systems.
X meter 1. An instrument for measuring reactance
and phase angle. 2. A form of simple capacitance
meter whose dial is direct-reading in microfarads,
although the deflection is actually proportional to
the reactance of the capacitor under measurement.
Constant-voltage
ac input
Capacitor
under test
Very low
resistance
X meter, 2
Electronic
ac
voltmeter
xmission Abbreviation of transmission.
xmit Abbreviation of transmit. Also, xmt.
xmitter Abbreviation of TRANSMITTER. Also, xmtr.
XMODEM In data transmission, an error-correcting
mode in which data is sent in blocks of 128
kilobytes (128K), or 131,072 bytes. The source
and destination tally up the bytes in each block.
If they agree, the next data block is sent. If they
do not agree, the current data block is retransmitted.
Compare YMODEM and ZMODEM.
xmt Abbreviation of transmit. Also, xmit.
xmtr Abbreviation of TRANSMITTER. Also, xmitter.
XOR Abbreviation of EXCLUSIVE-OR.
xover Abbreviation of CROSSOVER.
X particle See MESON.
xponder Abbreviation of TRANSPONDER.
X position 1. The alignment of a cathode-ray beam
along the horizontal axis of an oscilloscope
screen. 2. The position of a point, with respect to
the horizontal axis of a graph in the rectangular
(Cartesian) coordinate system.
XR Abbreviation of INDEX REGISTER.
X radiation Electromagnetic energy in the form of
X rays.
X-ray 1. Phonetic alphabet communications code
word for the letter X. 2. Pertaining to, or consisting
of, X rays.
X-ray astronomy The science of observing celestial
objects and the sky in the X-ray band of wavelengths.
Generally, this must be done from above
the earth’s atmosphere because the atmosphere
absorbs X rays.
X-ray crystallography The science of observing
atomic patterns in a crystal by means of X rays.
X-ray detecting device 1. An X-ray instrument for
spotting flaws in solid bodies. 2. A device, such as
a fluoroscope, for showing the presence of X rays.
X-ray diagnosis The use of X rays in the diagnosis
of disease and in the observation of internal parts
of the body.
X-ray diffraction The diffraction of X rays by a
material into or onto which they are directed.
Also see X-RAY DIFFRACTION CAMERA and
X-RAY DIFFRACTION PATTERN.
X-ray diffraction camera A special camera that
furnishes a photograph of the pattern created by X
rays diffracted by a material. See X-RAY DIFFRAC-
TION and X-RAY DIFFRACTION PATTERN.
X-ray diffraction pattern The pattern produced
on film exposed to X rays diffracted by a material.
Also see X-RAY DIFFRACTION and X-RAY
DIFFRACTION CAMERA.
X-ray goniometer An instrument used to find the
position of the axes of a quartz crystal. It uses X
rays reflected from the atomic planes of the
crystal.
X-ray inspection The use of X rays in the examination
and study of the internal features of materials
and devices.
X-ray laser A laser designed to emit coherent
X rays in a narrow beam.
X-ray load 1. An X-ray tube that is the terminal
member of an electronic system. 2. A body, mass,
or material exposed to X rays.
X-ray machine A device that generates X rays for a
specific purpose, such as medical diagnosis.
X-ray photograph A photograph made by exposure
to X rays, especially an X-ray shadowgram,