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absolute galvanometer - перевод на греческий
INSTRUMENT THAT PROVIDED THE FIRST PRACTICAL ELECTROCARDIOGRAM
Einthoven galvanometer
absolute galvanometer
απόλυτο γαλβανόμετρο
absolute value
NONNEGATIVE NUMBER WITH THE SAME MAGNITUDE AS A GIVEN REAL NUMBER
Modulus function; Absolute value (mathematics); Absolute Value; Absolute Value (mathematics); Absolute Values; Absolute values; Absolute Square; Abs(); Modulus of complex number; Fabs(); Math.fabs; Module of a complex number; Complex abs; Absolute value of number; Magnitude of Complex Number; Absolute value of a complex number; Modulus of a complex number; Magnitude of a complex number; Abs(x)
απόλυτη αξία, απόλυτη τιμή
απόλυτο γαλβανόμετρο
absolute galvanometer
Определение
Galvanometer
An instrument for measuring current strength and sometimes for measuring
inferentially potential difference, depending on the action of a
magnetic field established by the current, such action being exerted on
a magnetic needle or its equivalent.
A current passing through a conductor establishes circular lines of
force. A magnetic needle placed in their field is acted on and tends to
place itself parallel with the lines, in accordance with the principles
of current induction. (See Induction, Electro-magnetic.) A common
compass held near a conductor through which a current is passing tends
to place itself at right angles to such conductor. For a maximum effect
the conductor or the part nearest the needle should lie in the magnetic
meridian. If at right angles thereto its action will only strengthen the
directive force of the earth's induction or magnetic field, as the
needle naturally points north and south. Such combination is virtually a
galvanometer.
A typical galvanometer comprises a flat coil of wire placed horizontally
within which a magnetic needle is delicately poised, so as to be free to
rotate with the least possible friction. The needle may be supported on
a sharp point like a compass needle, or may be suspended by a long fine
filament. It should be covered by a glass plate and box, or by a glass
shade. Finally a graduated disc may be arranged to show the amount of
deflection of the needle.
In use the apparatus is turned about until the needle, as acted on by
the earth's magnetic field, lies parallel to the direction of the coils
of wire. On passing a current through the coil the needle is deflected,
more or less, according to its strength.
By using exceedingly fine wire, long enough to give high resistance, the
instrument can be used for very high potentials, or is in condition for
use in determining voltage. By using a coil of large wire and low
resistance it can be employed in determining amperage. In either case
the deflection is produced by the current.
The needle is often placed above or below the coil so as only to receive
a portion of its effect, enough for all practical purposes in the
commoner class of instruments.
The galvanometer was invented by Schweigger a short time after Oersted's
discovery, q. v.
Википедия
String galvanometer
A string galvanometer is a sensitive fast-responding measuring instrument that uses a single fine filament of wire suspended in a strong magnetic field to measure small currents. In use, a strong light source is used to illuminate the fine filament, and the optical system magnifies the movement of the filament allowing it to be observed or recorded by photography. The principle of the string galvanometer remained in use for electrocardiograms until the advent of electronic vacuum-tube amplifiers in the 1920s.
