Mirror Galvanometer

—A very delicate M. M. F.—Abbreviation for magneto motive galvanometer in which a small mirror is force. attached to the needle, so that a beam of light is reflected upon a scale, and the Mobility of Ions.—In electrolysis, the slightest motion of the needle is magnified; electrolyte is regarded as composed of a reflecting galvanometer. positive ions called cations and negative Sir William Thomson's mirror galvanometer has ions called anions. These ions move along a body consisting of a bobbin on which is wound the lines of electric force which pa a coil. The magnet consists of one or more small through the electrolyte from one electrode pieces of steel watch spring attached to the back of a light concave silvered gla mirror weighing to the other. The mobility or migration about three grains. The mirror is suspended by a velocity is the speed with which the ions cocoon silk fibre within the coil, A curved magmove when acted upon by unit force. net is provided which counteracts the magnetism of the earth. Opposite the galvanometer is placed the scale, and a beam of light from a lamp pa es Moderate Speed Generator.—A through a narrow aperture under the scale and dynamo intended to operate at a moderate falls on the mirror from which it is reflected upon the scale. speed.