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sity of an electric current, usually by the deflection of a magnetic needle. Differential galvanometer. See under Differental, a. -- Sine galvanometer, Cosine galvanometer, Tangent galvanometer (Elec.), a galvanometer in which the sine, cosine, or tangent respectively, of the angle through which the needle is deflecte…

A galvanometer in which current is measured by torsion.

tism), a pair of magnetic needles so mounted as to be nearly or quite astatic, as in some galvanometers.

aking a beat without recoil; giving indications by a single beat or excursion; -- said of galvanometers and other instruments in which the needle or index moves to the extent of its deflection and stops with little or no further oscillation. Deadbeat escapement. See under Escapement.

mposed equally upon the same products imported from different countries. -- Differential galvanometer (Elec.), a galvanometer having two coils or circuits, usually equal, through which currents passing in opposite directions are measured by the difference of their effect upon the needle. -- Differential gearing, a tr…

Of, pertaining to, or measured by, a galvanometer.

alternating-current wave forms or other electrical oscillations, usually consisting of a galvanometer with strong field, in which the mass of the moving part is very small and frequency of vibration very high. -- Os`cil*lo*graph"ic (#), a.

arries, and differing from the sextant chiefly in having an entire circle. -- Reflecting galvanometer, a galvanometer in which the deflections of the needle are read by means of a mirror attached to it, which reflects a ray of light or the image of a scale; -- called also mirror galvanometer. -- Reflecting goniometer…

ument for measuring currents, especially the force or intensity of electrical currents; a galvanometer.

To provide with a shunt; as, to shunt a galvanometer.

ressing the length of the tangent of an arc, the radius being reckoned unity. -- Tangent galvanometer (Elec.), a form of galvanometer having a circular coil and a short needle, in which the tangent of the angle of deflection of the needle is proportional to the strength of the current. -- Tangent of an angle, the nat…

variations in the strength of the current, which variations are indicated by a sensitive galvanometer. It is also used for measuring minute changes of temperature. T. A. Edison.

metals having different capacities for the conduction of heat, connected with an astatic galvanometer, which is very sensibly affected by the electric current induced in the system of bars when exposed even to the feeblest degrees of heat.

etc., by so opposing them that the pointer of an indicating apparatus, or the needle of a galvanometer, remains at, or is brought to, zero, as contrasted with methods in which the deflection is observed directly; -- called also null method. -- Zero point, the point indicating zero, or the commencement of a scale or re…