Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . es. See ,CTRO-M.\GNETIC In-di-gome-ter. An instrument for a-scertain-ing the strength of indigo. Indi-go-mill. A four-sided iron cistern, cylin-drical or rounded at bottom, resting upon gudgeonsin a wooden frame. It has an iron lid with twoleaves, between which works a rock-shaft receivinga vibratory motion from a crank, and imparting aswinging
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . es. See ,CTRO-M.\GNETIC In-di-gome-ter. An instrument for a-scertain-ing the strength of indigo. Indi-go-mill. A four-sided iron cistern, cylin-drical or rounded at bottom, resting upon gudgeonsin a wooden frame. It has an iron lid with twoleaves, between which works a rock-shaft receivinga vibratory motion from a crank, and imparting aswinging motion to a frame carrying rollers, threeon each side, which triturate tlie indigo to a finepaste ; when sutficiently ground, the paste is drawnoff by a stop-cock. In-duction. {Electricity.) That effect of an electrified body which tends to produce anopposite electrical state in surrounding bodies. In-duction-coil. A compound coil by whichvoltaic or dynamic electricity is converted into staticelectricity or electricity of high tension. The dis-coveries of Faraday, Henry, Beipierel, and others leilthe way to the invention of the induction-coil, andit is believed that the first practically useful device Fig ments of the kind and contrived various improve-ments, the instrument is now very generally calledby his name. It consists essentially of an inner coil of coarsewire surrounding a core of soft iron rods, and con-nected with the poles of a voltaic battery. It is it-self surrounded by, though insulated from, a coil ofcopper wile composed of a great number of convolu-tions, and connected with the discharging conduct-or. By o|iening and closing the circuit with greatrapidity, which is effected by means of the AuTO-M.\ric (which .see), a nearly con-tinuous current is produced. To intensify this, thereturn current from the priniary coil ]iroduced by thedisruption of the current is ] through a (which see) ; the eflect ma
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