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1 pole-changing winding
pole-changing winding polumschaltbare Wicklung fEnglish-German dictionary of Electrical Engineering and Electronics > pole-changing winding
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2 pole-changing winding
<el> ■ polumschaltbare Wicklung f ; Polwechselwicklung f -
3 Dahlander pole-changing winding
<el> ■ Dahlander-Wicklung fEnglish-german technical dictionary > Dahlander pole-changing winding
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4 motor
1) двигатель, проф. мотор3) автомобиль•-
abutment motor
-
ac converter-fed motor
-
ac electronic motor
-
ac motor
-
across-the-line motor
-
actuating motor
-
acyclic motor
-
adjustable varying-speed motor
- adjustable-constant speed motor -
adjustable-speed motor
-
air motor
-
all-watt motor
-
appliance motor
-
arch induction motor
-
armature-controlled motor
-
asynchronous motor
-
autosyn motor
-
autosynchronous motor
-
auxiliary motor
-
axial piston motor
-
axial-piston air motor
-
axle-hung motor
-
azimuth torque motor
-
barring motor
-
bipolar motor
-
booster motor
-
boost motor
-
brake motor
-
brushless dc linear motor
-
brushless motor
-
built-in motor
-
cage motor
-
capacitor motor
-
capacitor-start motor
-
capacitor-start-and-capacitor-run motor
-
changeable-pole motor
-
change-pole motor
-
change-speed motor
-
commutator motor
-
commutatorless motor
-
compensated induction motor
-
compensated motor
-
compensated linear induction motor
-
compound-wound motor
-
compound motor
-
concatenated motor
-
condenser motor
-
constant displacement motor
-
constant-current motor
-
constant-speed motor
-
constant-voltage motor
-
control motor
-
crane motor
-
cranking motor
-
crowd motor
-
crystal-controlled motor
-
current-displacement motor
-
cylindrical-rotor motor
-
dc electronic motor
-
dc motor
-
dc torque motor
-
deep bar motor
-
differential motor
-
digital motor
-
double-armature motor
-
double-commutator motor
-
double-deck induction motor
-
double-side linear motor
-
double-speed motor
-
double-squirrel cage motor
-
doubly-fed motor
-
downhole motor
-
drag-cup induction motor
-
drag-cup motor
-
dripproof motor
-
drive motor
-
driving motor
-
drooping speed motor
-
drum-wound motor
-
dual-voltage motor
-
dustproof motor
-
efficient motor
-
electric controlling motor
-
electric downhole motor
-
electric motor
-
electric starting motor
-
electrohydraulic pulse motor
-
electronically commutated brush-less dc motor
-
electrostatic motor
-
enclosed fan-cooled motor
-
enclosed self-cooled motor
-
enclosed self-ventilated motor
-
enclosed separately ventilated motor
-
enclosed-type motor
-
energy efficient motor
-
energy saver motor
-
erection torque motor
-
explosion-proof motor
-
fan-duty motor
-
fan motor
-
feathering motor
-
feed motor
-
flange-mounted motor
-
flange motor
-
floor-mounted motor
-
floor motor
-
follow-up motor
-
forced-ventilation motor
-
fractional horsepower motor
-
fully enclosed motor
-
gear hydraulic motor
-
geared motor
-
gear motor
-
geared starter motor
-
gearless motor
-
general-purpose motor
-
handgrip motor
-
high-phase order induction motor
-
high-slip induction motor
-
high-slip motor
-
high-speed motor
-
high-voltage motor
-
home-going motor
-
hydraulic downhole motor
-
hydraulic motor
-
hydraulic step motor
-
hydraulic turbine downhole motor
-
hydraulic wheel motor
-
hysteresis synchronous motor
-
hysteresis-reluctance motor
-
induction motor
-
inductor motor
-
integrated motor
-
interpole motor
-
leveling torque motor
-
linear induction motor
-
linear motor
-
linear pulse motor
-
linear reluctance motor
-
linear synchronous motor
-
line-fed motor
-
line-start motor
-
load-start motor
-
low-inertia high-torque motor
-
machine-tool motor
-
main motor
-
mine motor
-
mud motor
-
multiple-winding motor
-
multipolar motor
-
multipole motor
-
multispeed motor
-
navy motor
-
needle positioning clutch motor
-
nonreversible motor
-
nonsalient pole motor
-
one-cylinder motor
-
open motor
-
open-loop stepping motor
-
outboard motor
-
outdoor motor
-
permanent-magnet motor
-
phase-wound rotor motor
-
photovoltaic motor
-
pilot motor
-
piston hydraulic motor
-
pitch erection torque motor
-
PM motor
-
point motor
-
pole-changing motor
-
polyphase motor
-
pony motor
-
power plant motor
-
printed-circuit motor
-
programmable drive motor
-
propel motor
-
propulsion motor
-
quiet low rpm induction motor
-
railway motor
-
reactor-start motor
-
reactor-start split-phase motor
-
reciprocating motor
-
reduction motor
-
reluctance motor
-
reluctance-augmented shaded-pole motor
-
repulsion motor
-
repulsion-start induction-run motor
-
repulsion-start induction motor
-
resiliently mounted traction motor
-
resistance-start motor
-
reversible hydraulic motor
-
reversible motor
-
reversing motor
-
roll erection torque motor
-
rotary-field motor
-
rotating case axial piston motor
-
rotating induction motor
-
round-rotor motor
-
screw hydraulic downhole motor
-
screw downhole motor
-
sectional downhole motor
-
self-controlled inverter-fed synchronous motor
-
self-controlled synchronous motor
-
self-excited motor
-
self-starting motor
-
self-ventilated motor
-
selsyn motor
-
semienclosed motor
-
semiclosed motor
-
separately excited motor
-
series-wound motor
-
series motor
-
servo motor
-
shaded-pole motor
-
shaftless motor
-
shell-type motor
-
shielded pole motor
-
short motor
-
shunt-wound motor
-
shunt motor
-
single-frame motor
-
single-phase motor
-
single-side linear motor
-
slave motor
-
slaving torque motor
-
slip-ring induction motor
-
slip-ring motor
-
special-purpose motor
-
splash-proof motor
-
split-field motor
-
split-phase motor
-
split-pole motor
-
squirrel-cage induction motor
-
squirrel-cage motor
-
starter motor
-
starting motor
-
steering electric motor
-
step-by-step motor
-
step motor
-
stepper motor
-
stepping motor
-
subfractional horsepower electrical motor
-
submersible motor
-
superconducting motor
-
switch motor
-
synchro motor
-
synchronous motor
-
take-home motor
-
tap-field motor
-
three-phase motor
-
throttle servo motor
-
thyratron motor
-
thyristor-controlled motor
-
thyristor motor
-
torque motor
-
totally enclosed motor
-
toy motor
-
traction motor
-
turbine air motor
-
turbine motor
-
two direction hydraulic motor
-
two-phase motor
-
two-pole motor
-
two-speed motor
-
two-value capacitor motor
-
undulated-current motor
-
universal motor
-
unlaminated-rotor induction motor
-
vacuum motor
-
variable displacement hydraulic motor
-
variable speed dc motor
-
variable-speed motor
-
varying-speed motor
-
ventilated motor
-
vertical shaft motor
-
volumetric downhole motor
-
watertight motor
-
winding-duty motor
-
winding motor
-
wound-rotor induction motor -
5 Rawcliffe, Gordon Hindle
SUBJECT AREA: Electricity[br]b. 2 June 1910 Sheffield, Englandd. 3 September 1979 Bristol, England[br]English scientist and inventor of the multi-speed induction motor using the pole amplitude modulation principle.[br]After graduating from Keble College, Oxford, Rawcliffe joined the Metropolitan Vickers Electrical Company in 1932 as a college apprentice, and later became a design engineer. This was followed by a period as a lecturer at Liverpool University, where he was able to extend his knowledge of the principles underlying the design and operation of electrical machines. In 1941 he became Head of the Electrical Engineering Department at the Robert Gordon Technical College, Aberdeen, and Lecturer in charge of Electrical Engineering at Aberdeen University. In 1944 Rawcliffe was appointed to the Chair of Electrical Engineering at the University of Bristol, where he remained until his retirement in 1975. The reputation of his department was enhanced by the colleagues he recruited.After 1954 he began research into polyphase windings, the basis of alternating-current machinery, and published papers concerned with the dual problems of frequency changing and pole changing. The result of this research was the discovery in 1957 of a technique for making squirrel-cage induction motors run at more than one speed. By reversing current in one part of the winding, the pole distribution and number were changed, and with it the speed of rotation.Rawcliffe's name became synonymous with pole amplitude modulation, or PAM, the name given to this technique. Described by Rawcliffe as a new philosophy of windings, the technique led to a series of research papers, patents and licensing agreements in addition to consultancies to advise on application problems. Commercial exploitation of the new idea throughout Western Europe, the United Kingdom and the United States followed. In total he contributed twentyfive papers to the Proceedings of the Institution of Electrical Engineers and some sixty British patent applications were filed.[br]Principal Honours and DistinctionsFRS 1972. Royal Society S.G.Brown Medal 1978.Bibliography21 August 1958, British patent no. 900,600 (pole amplitude modulation).1958, with R.F.Burbridge and W.Fong, "Induction motor speed changing by pole amplitude modulation", Proceedings of the Institution of Electrical Engineers 105 (Part A): 411–19 (the first description of pole amplitude modulation).Further ReadingBiographical Memoirs of Fellows of the Royal Society, 1981, Vol. XXVII, London, pp. 479–503 (includes lists of Rawcliffe's patents and principal papers published).GWBiographical history of technology > Rawcliffe, Gordon Hindle
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6 motor
двигатель; мотор || двигательный; приводимый в движение двигателем- adjustable constant speed motor
- adjustable speed motor
- adjustable varying speed motor
- air motor
- air spindle motor
- air-bearing motor
- alternating current motor
- axial piston motor
- axis drive motor
- axis motor
- band drive motor
- blender motor
- brake motor
- brush-commutated motor
- brushless motor
- brush-type motor
- cage induction motor
- cage synchronous motor
- capacitor motor
- capacitor start and run motor
- capacitor start motor
- C-face motor
- change speed motor
- commutator motor
- compensated motor
- compositely excited motor
- compound motor
- compound-wound motor
- constant displacement motor
- constant speed motor
- control motor
- controlling motor
- coordinate drive motor
- coordinate motor
- corrector motor
- DC torque motor
- definite purpose motor
- Deri motor
- digital motor
- digital spindle motor
- direct current motor
- direct drive motor
- direct drive spindle motor
- double-acting hydraulic motor
- double-pole motor
- drill motor
- drive feed motor
- drive motor
- driving motor
- dual-field motor
- dual-winding motor
- electric feed motor
- electric torque motor
- electrohydraulic pulse motor
- electronic stepper motor
- erection torque motor
- feed air motor
- feed drive motor
- feed motor
- feed slide motor
- fixed displacement hydraulic motor
- fixed speed motor
- flange-mounted motor
- flat-sided motor
- fluid motor
- follow-up motor
- foot-mounted motor
- forward-and-reverse motor
- frameless brushless DC motor
- frequency regulated motor
- functional motor
- gear motor
- geared motor
- gear-type hydraulic motor
- general purpose motor
- grinding motor
- high-torque motor
- high-torque servo motor
- hydraulic control motor
- hydraulic cylinder motor
- hydraulic motor
- hysteresis motor
- indexing motor
- infeed motor
- integral-spindle motor
- integrated motor
- limited rotary hydraulic motor
- limited rotary pneumatic motor
- linear hydraulic motor
- linear motor
- linear pulse motor
- low-inertia high-torque motor
- low-inertia motor
- low-mass motor
- machine axis drive motor
- main drive motor
- main-spindle motor
- mill motor
- multiconstant speed motor
- multiple-acting motor
- multispeed motor
- multivarying speed motor
- nonreversing motor
- oil cooled motor
- open loop stepping motor
- orbital motor
- permanent magnet motor
- permanent split capacitor motor
- pistol grip motor
- piston motor
- piston-type limited rotary hydraulic motor
- PM motor
- PM step motor
- pneumatic motor
- pole-changing motor
- positioning motor
- positive displacement hydraulic motor
- power motor
- primary motor
- printed-circuit motor
- programmable drive motor
- programmable motor
- proportioning motor
- PWM-controlled motor
- radial drive motor
- radial piston motor
- rail traverse motor
- rapid advance motor
- reciprocating motor
- reciprocation motor
- reluctance motor
- repeater motor
- repulsion motor
- resistance start split phase motor
- reversible hydraulic motor
- reversible motor
- rotary abutment motor
- rotary diaphragm motor
- rotary hydraulic motor
- rotary motor
- rotary piston motor
- rotary pneumatic motor
- rotary vane motor
- rotodynamic hydraulic motor
- round rotor motor
- Schrage motor
- screw motor
- self-compensated motor
- self-excited motor
- self-feed drill motor
- separately excited motor
- series motor
- series-wound motor
- servo motor
- shaded pole motor
- short-circuited motor
- shunt motor
- shunt-wound motor
- sight-offset motor
- single-acting motor
- single-phase motor
- slip ring motor
- small-power motor
- special purpose motor
- speed-controlled motor
- spindle drive motor
- spindle rotation drive motor
- split phase motor
- split-series motor
- squirrel-cage induction motor
- squirrel-cage motor
- standard dimensioned motor
- starter motor
- starting motor
- steering motor
- step motor
- stepper motor
- stepping motor
- subfractional horsepower motor
- synchronous motor
- synchronous stepping motor
- three-phase motor
- thyristor-controlled motor
- thyristor-controlled servo motor
- tool head travel motor
- tool motor
- tool-indexing motor
- torque motor
- traction electric motor
- traction motor
- transistorized motor
- triple-wound motor
- two-direction hydraulic motor
- two-phase induction motor
- two-value capacitor motor
- two-winding motor
- universal motor
- valve control motor
- vane motor
- vane-type limited rotary hydraulic motor
- variable displacement hydraulic motor
- variable frequency AC motor
- variable speed motor
- varying speed motor
- vertical drive motor
- VR step motor
- washdown duty motor
- washdown motor
- watertight motor
- wound-rotor induction motor
- X-drive motor
- Y-drive motor
- Z-drive motorEnglish-Russian dictionary of mechanical engineering and automation > motor
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7 starter
1) эл. пусковое устройство, пускатель, стартер; пусковой реостат2) диспетчер3) зажигатель6) стартёр (1. устройство для пуска двигателя 2. устройство для зажигания электролюминесцентных ламп)7) забурник; короткий бур ( для начала бурения)9) пищ. закваска•-
air-turbine starter
-
automatic motor starter
-
autotransformer starter
-
cascade starter
-
closed circuit transition starter
-
closed transition starter
-
contactor starter
-
crank starter
-
direct-cranking starter
-
drum switch starter
-
drum starter
-
electric starter
-
enclosed starter
-
group starter
-
hand starter
-
hydraulic starter
-
impedance starter
-
impulse starter
-
inching starter
-
increment starter
-
inductor starter
-
inertia starter
-
lamp resistance starter
-
liquid starter
-
magnetic full-voltage starter
-
medium-voltage motor starter
-
motor starter
-
motor-driven starter
-
multiple-switch starter
-
multistep starter
-
oil starter
-
oil-cooled starter
-
on-line starter
-
open starter
-
part-winding starter
-
pole-changing starter
-
push-button starter
-
reactance starter
-
reconnection starter
-
reduced-current starter
-
reduced-voltage starter
-
relay-operated starter
-
reversing-type starter
-
rheostatic starter
-
rotor-resistance starter
-
series-parallel starter
-
slow-motion starter
-
solenoid starter
-
solid-state starter
-
star-delta starter
-
stator starter
-
straight-on starter
-
switching starter
-
switch starter
-
three-phase starter
-
transformer starter
-
turbine starter
-
water resistance starter
-
Y-delta starter -
8 transformer
3) пищ. котёл для получения инвертированного сиропа•-
adapter transformer
-
adjustable transformer
-
air transformer
-
air-blast transformer
-
air-cooled transformer
-
air-core transformer
-
air-natural transformer
-
amorphous-core transformer
- arc furnace transformer -
arc-welding transformer
-
audio-frequency transformer
-
autocompounded current transformer
-
autocompounded voltage transformer
-
autoconnected transformer
-
auxiliary transformer
-
balanced-to-unbalanced transformer
-
balance-to-unbalanced transformer
-
balanced-to-unbalance transformer
-
balance-to-unbalance transformer
-
balanced transformer
-
balancing transformer
-
ballast transformer
-
banked distribution transformers
-
bar-type transformer
-
bell transformer
-
booster transformer
-
bridge transformer
-
busbar current transformer
-
capacitive voltage transformer
-
cascade transformer
-
cast resin transformer
-
center-tapped transformer
-
closed core transformer
-
code transformer
-
combined voltage and current transformer
-
compensated current transformer
-
compensated voltage transformer
-
compound-filled instrument transformer
-
constant-current transformer
-
constant-potential transformer
-
control circuit transformer
-
control transformer
-
converter transformer
-
coreless transformer
-
core-type transformer
-
coupling transformer
-
current transformer
-
decoupling transformer
-
differential transformer
-
diode-split line-output transformer
-
direct-current transformer
-
distribution transformer
-
double-stub transformer
-
double-tuned transformer
-
double-winding transformer
-
driving transformer
-
dry-type transformer
-
dry transformer
-
dry-type forced-air-cooled transformer
-
dry-type self-cooled transformer
-
E transformer
-
earthed transformer
-
earthing transformer
-
effective grounded transformer
-
EHV power transformer
-
excitation transformer
-
extra-high-voltage power transformer
-
feed transformer
-
feeder transformer
-
feeding transformer
-
filter transformer
-
five-legged transformer
-
flash transformer
-
flyback transformer
-
forced-air-cooled transformer
-
forced-oil transformer
-
frame-output transformer
-
furnace transformer
-
gas-filled transformer
-
gas-insulated transformer
-
general transformer
-
general-purpose transformer
-
grounded transformer
-
grounding transformer
-
high-potential transformer
-
high-power transformer
-
high-voltage transformer
-
horizontal-output transformer
-
house transformer
-
hydropneumatic transformer
-
ideal transformer
-
image-output transformer
-
impedance transformer
-
impedance-matching transformer
-
impulse current transformer
-
indoor transformer
-
induction voltage transformer
-
injector transformer
-
input transformer
-
instrument transformer
-
insulated-core transformer
-
insulating transformer
-
integral current transformer
-
interphase transformer
-
intervening current transformer
-
iron-clad transformer
-
iron-core transformer
-
isolating transformer
-
lightning-proof transformer
-
line regulating transformer
-
line transformer
-
linear hydraulic transformer
-
line-output transformer
-
liquid-filled transformer
-
loading transformer
-
low-power transformer
-
low-voltage transformer
-
mains transformer
-
manhole transformer
-
matching transformer
-
measuring transformer
-
micromodular transformer
-
mode transformer
-
molded transformer
-
multiratio current transformer
-
multiratio voltage transformer
-
multiwinding transformer
-
natural-draft transformer
-
network transformer
-
nonmagnetic current transformer
-
nonresonating transformer
-
oil-cooled transformer
-
oil transformer
-
oil-filled instrument transformer
-
oil-immersed forced-air-cooled transformer
-
oil-immersed forced-oil-cooled transformer
-
oil-immersed self-cooled transformer
-
oil-immersed transformer
-
oil-immersed water-cooled transformer
-
one-coil transformer
-
one-to-one transformer
-
on-load tap-changing transformer
-
open-core transformer
-
outdoor transformer
-
output transformer
-
pad-mounted transformer
-
peaking transformer
-
peak transformer
-
phase-shifting transformer
-
pole-type transformer
-
polyphase transformer
-
potential transformer
-
power transformer
-
protection current transformer
-
protection voltage transformer
-
protective transformer
-
pulse transformer
-
pulse-forming transformer
-
radio-frequency transformer
-
reactance-earthed transformer
-
reactor transformer
-
rectifier transformer
-
reducing transformer
-
regulating transformer
-
relay transformer
-
resistance-earthed transformer
-
resonance transformer
-
rotary hydraulic transformer
-
rotary transformer
-
rotatabletransformer
-
saturable current transformer
-
saturable transformer
-
saturating current transformer
-
sealed transformer
-
self-cooled transformer
-
self-protected transformer
-
series regulating transformer
-
series transformer
-
SF6-filled transformer
-
shell-core transformer
-
shell-form
-
shell-type transformer
-
shunt transformer
-
signal transformer
-
single-phase transformer
-
single-turn current transformer
-
small-power transformer
-
solidly earthed transformer
-
spare transformer
-
standard current transformer
-
standard instrument transformer
-
standard potential transformer
-
standby transformer
-
starting transformer
-
step-down transformer
-
step-up transformer
-
subdivided transformer
-
submersible transformer
-
substation transformer
-
supply transformer
-
tank transformer
-
tap-changing transformer
-
tap-changing-under-load transformer
-
tapped transformer
-
teaser transformer
-
testing transformer
-
test transformer
-
thermal transformer
-
three-circuit transformer
-
three-legged transformer
-
three-leg transformer
-
three-phase transformer
-
three-winding transformer
-
through-type current transformer
-
tool transformer
-
toroidal-coretransformer
-
toroidaltransformer
-
track-circuit transformer
-
track transformer
-
traction-feeding transformer
-
triple-wound transformer
-
tuned transformer
-
two-winding transformer
-
unbalanced-to-balanced transformer
-
unbalance-to-balanced transformer
-
unbalanced-to-balance transformer
-
unbalance-to-balance transformer
-
unearthed transformer
-
variable-ratio transformer
-
vertical-output transformer
-
voltage measuring transformer
-
voltage transformer
-
water-cooled transformer
-
welding transformer
-
window-type current transformer
-
zero-phase sequence current transformer
См. также в других словарях:
pole-changing winding — keičiamo polių skaičiaus apvija statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
change-pole winding — keičiamo polių skaičiaus apvija statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
enroulement à nombre de pôles variable — keičiamo polių skaičiaus apvija statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
keičiamo polių skaičiaus apvija — statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
polumschaltbare Wicklung — keičiamo polių skaičiaus apvija statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
полюсно-переключаемая обмотка — keičiamo polių skaičiaus apvija statusas T sritis automatika atitikmenys: angl. change pole winding; pole changing winding vok. polumschaltbare Wicklung, f rus. полюсно переключаемая обмотка, f pranc. enroulement à nombre de pôles variable, m … Automatikos terminų žodynas
Gordon Hindle Rawcliffe — (* 2. Juni 1910 in Sunny Bank, Sheffield; † 3. September 1979 in Clifton, Bristol) war ein britischer Elektroingenieur und Hochschullehrer. Leben Seine Eltern waren Rev. James Hindle Rawcliffe (1874–1920) und May Jane, geb. Thompson (1883–1940).… … Deutsch Wikipedia
electric motor — motor (def. 4). [1885 90] * * * Introduction any of a class of devices that convert electrical energy to mechanical energy, usually by employing electromagnetic phenomena. Most electric motors develop their mechanical torque by the… … Universalium
PKP class ET21 — Infobox Locomotive Auto name = ET21 powertype = Electric caption = ET22 351 locomotive builder = Pafawag serialnumber = buildmodel = 3E, 3E/1 builddate = 1957 1971 totalproduction = 726 whytetype = aarwheels = uicclass = Co Co gauge =… … Wikipedia
AC motor — An AC motor is an electric motor that is driven by an alternating current. It consists of two basic parts, an outside stationary stator having coils supplied with AC current to produce a rotating magnetic field, and an inside rotor attached to… … Wikipedia
Doubly fed electric machine — Doubly fed electric machines are electric motors or electric generators that have windings on both stationary and rotating parts, where both windings transfer significant power between shaft and electrical system. Doubly fed machines are useful… … Wikipedia
