BALL n.
the end of a lever. -- Ball gudgeon, a pivot of a spherical form, which permits lateral deflection of the arbor or shaft, while retaining the pivot in its socket. Knight. -- Ball lever, the lever used in a ball cock. -- Ball of the eye, the eye itself, as distinguished from its lids and socket; -- formerly, the pup…
GALVANOMETER n.
nstrument or apparatus for measuring the intensity 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…
TANGENT n.
vanometer 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 natural tangent of the arc subtending or measuring the angle. -- Tangent of an arc, a right line, as ta, touching the arc of a…
ZERO n.
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 reckoning.