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Diagram for testing open- or short-circuited generator armature coil with ammeter.

Armature Coil

Diagram for testing open- or short-circuited generator armature coil with ammeter.

"Magnetic hysteresis in armature core. Unlike poles are induced in the core opposte the poles of the field magnet. Since on account of the rotation of the core the induced poles are reversed a thousand or more times a minute, considerable energy is required to change the positions of the molecules f the iron for each reversal, resulting in the generation of heat at the expense of a portion of the energy required to drive the armature." -Hawkins, 1917

Magnetic Hysteresis in Armature Core

"Magnetic hysteresis in armature core. Unlike poles are induced in the core opposte the poles of the…

"Gramme ring armature with six coils." — Hawkins, 1917

Gramme ring armature

"Gramme ring armature with six coils." — Hawkins, 1917

"Distribution of magnetic lines through a ring armature. Since the lines follow the metal of the ring instead of penetrating the interior no electromotive force is induced in that portion of the winking lying on the interior surface of the ring. There is, therefore, a large amount of dead wire or wire that is ineffective in inducing electromotive force; that is the chief objective to the ring type of armature." -Hawkins, 1917

Distribution of Magnetic Lines, Ring Armature

"Distribution of magnetic lines through a ring armature. Since the lines follow the metal of the ring…

"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced currents. the currents in the winding under the upper N and S poles are opposed to each other and flow to the external circuit by the positive brush 1, and back to this half of the armature by the negative brushes 3 and 4...The armature is said to be 'cross connected.' " -Hawkins, 1917

Ring Armature

"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced…

"Consists of a coil of wire wound in two broad grooves plowed on opposite sides of an iron cylinder." — Avery, 1895

Siemens armature

"Consists of a coil of wire wound in two broad grooves plowed on opposite sides of an iron cylinder."…

"The tip or armature of a gas-burning lamp or bracket, through which the gas is caused to issue for consumption." -Whitney, 1911

Argand Gas Burner

"The tip or armature of a gas-burning lamp or bracket, through which the gas is caused to issue for…

"The tip or armature of a gas-burning lamp or bracket, through which the gas is caused to issue for consumption." -Whitney, 1911

Bat's Wing Gas Burner

"The tip or armature of a gas-burning lamp or bracket, through which the gas is caused to issue for…

"If the connections of the armature coils are reversed at the moment when the current in the coils is reversed, the induced currents will all flow in the same direction in the external circuit. There are many different ways of connecting armature coils with their commutators. The numbered loops represent the armature coils joined in series as in the ring armature." — Avery, 1895

Commutator

"If the connections of the armature coils are reversed at the moment when the current in the coils is…

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened into dovetail notches in the spider as shown." — Hawkins, 1917

Armature core

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened…

The armature of a dynamo machine by Brush Electric Company. The dynamo machine, now known as an electrical generator, is a device that converts mechanical energy into electrical energy.

Dynamo Machine

The armature of a dynamo machine by Brush Electric Company. The dynamo machine, now known as an electrical…

"Where a motor is connected with the electric circuit of a dynamo...and the armature of the dynamo is rotated by mechanical power in opposition to the electromagnetic force, an electric current is generated, which tranverses the motor and causes its armature to rotate..." -Atkinson 1903

Connected dynamo and motor

"Where a motor is connected with the electric circuit of a dynamo...and the armature of the dynamo is…

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

Four Pole Machine

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

"Method of drying out a generator by short-circuiting the armature leads through a water rheostat." —Croft 1920

Method For Drying Out a Generator

"Method of drying out a generator by short-circuiting the armature leads through a water rheostat."…

Testing the insulation resistance of an armature.

insulation resistance

Testing the insulation resistance of an armature.

"Testing the insulation resistance of an armature." —Croft 1920

Measure Armature Insulation Resistance

"Testing the insulation resistance of an armature." —Croft 1920

"D is a Leyden jar, fastened to a stand in such a way that its outer armature can be insulated or connected to earth at will. The inner armature is in good metallic connection with the knob C. A horizontal metal piece A is mounted on a glass pillar, and carries another knob, which can be set at any required distance from C by means of a screw and graduation. The piece A is connected with the outer armature of the jar by a thin wire B contained in a glass tube." — Encyclopedia Britannica, 1893

Lanes Jar

"D is a Leyden jar, fastened to a stand in such a way that its outer armature can be insulated or connected…

"The two most common forms of artificial magnets are the bar magnet and the horseshoe magnet. The first of these is a straight bar of iron and steel; the second is U-shaped." — Avery, 1895

Horseshoe magnet

"The two most common forms of artificial magnets are the bar magnet and the horseshoe magnet. The first…

Position of Magneto Armature for "Advanced" and "Retarded" ignition.

Magneto Armature

Position of Magneto Armature for "Advanced" and "Retarded" ignition.

"...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…

Diagram for locating short-circuits between motor and generator armature coils.

Short-Circuits

Diagram for locating short-circuits between motor and generator armature coils.