ALTERNATORS, ELECTRICAL

The namo, is a machine for supplying electrical energy in the form of an alternating electric current, in exchange for some form of mechanical energy supplied to it. The principle on which alternators work depends upon the fact that when a circuit of wire is made to rotate in a magnetic field between two magnetic poles, the electric current thus set up in the wire flows in one direction during the first half of the revolution, and in the opposite direction during the second half of the revolution. In actual practice the energy producing rotation is supplied by a steam engine or other mechanical contrivance. Instead of one wire many turns of wire are wound round the armature of soft iron which is introduced to strengthen the magnetic field. To supply the current to the external circuit the ends of the armature coils are connected to collecting rings. These rings revolve with the armature, and bear copper or carbon brushes that pick up the current and transmit it to the terminals of the machine, whence it is distributed. Alternators are particularly useful where a - large output is required. (1869), operatic tenor; 6. Reading, Pa. He was the first American tenor without European training to make a debut in a leading role at the Metropolitan Opera House, New York, where he appeared in 1913 as Dimitri in Boris Godounov. Other operas in which he took part as a leading tenor included Aida, Cavalleria Rusticana, Pagliacci, Carmen, Tosca, Faust and Thais. He also became a prominent figure at musical festivals and | orchestral concerts throughout the U.S.