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"The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings instead of a communtator so that the current is delivered just as it is generated, and a small direct current dynamo for engergizing its field magnets, the pole-pieces of which are generally very numerous." -Avery 1895

Alternator

"The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings…

"Fuse protection on instrument circuit of an alternating-current switchboard." —Croft 1920

Fuse Protection on Alternating Current Switchboard

"Fuse protection on instrument circuit of an alternating-current switchboard." —Croft 1920

"The hydraulic ram uses alternating water pressure, air pressure, and suction to provide a steady stream of water through the delivery pipe, e." —Hallock 1905

Hydraulic Water Ram

"The hydraulic ram uses alternating water pressure, air pressure, and suction to provide a steady stream…

"Alternating current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

Cooper-Hewit Mercury Vapor Lamp

"Alternating current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

"...consists of a circular, multipolar field magnet, inclusing a cylinder armature with coils wound back and forth in grooces on its face." -Atkinson 1903

Altenating Current Motor

"...consists of a circular, multipolar field magnet, inclusing a cylinder armature with coils wound…

"Illustration showing the installation of an alternating current motor." —Croft 1920

Alternating Current Motor Installed

"Illustration showing the installation of an alternating current motor." —Croft 1920

"Tesla's oscillator is a combined prime motor and electric generator, and produces alternating currents without rotary motion of the generting coils. the motive force may be that of steam or of compressed air." -Avery 1895

Tesla's Oscillator

"Tesla's oscillator is a combined prime motor and electric generator, and produces alternating currents…