ClipArt ETC
"A much better form of electromagnetic ammeter can be constructed on a principle now extensively employed, which consists in pivoting in the strong field of a permanent magnet a small coil through which a part of the current to be measured is sent." —Encyclopedia Britannica, 1910

Shunted Movable Coil Ammeter

"A much better form of electromagnetic ammeter can be constructed on a principle now extensively employed,…

"Arc lamp mechanism with series regulating coil." —Croft 1917

Arc Lamp Series Regulating Coil

"Arc lamp mechanism with series regulating coil." —Croft 1917

"Arc lamp mechanism with shunt regulating coil." —Croft 1917

Arc Lamp with Shunt Regulating Coil

"Arc lamp mechanism with shunt regulating coil." —Croft 1917

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.

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

Gramme ring armature

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

"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 electrical symbol for a coil which surrounds an iron core but very seldom used on delco drawings.

Coil

The electrical symbol for a coil which surrounds an iron core but very seldom used on delco drawings.

The electrical symbol for a coil where there is no chance of confusion.

Coil

The electrical symbol for a coil where there is no chance of confusion.

A rod with a slender wire coiled loosely around it.

Coil around rod

A rod with a slender wire coiled loosely around it.

a conductor, as a copper wire, wound up in a spiral or other form.

Spiral Conducting Coil

a conductor, as a copper wire, wound up in a spiral or other form.

"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…

"Construction of condenser for an induction coil." — Hawkins, 1917

Condenser

"Construction of condenser for an induction coil." — Hawkins, 1917

"In order to make the winding and connections clear, one coil and the commutator is shown assembled, although the latter is not put in place until after all the sections have been wound, the ends of the wires being temporarily twisted together until all can be soldered to the risers." — Hawkins, 1917

Siemens' drum winding

"In order to make the winding and connections clear, one coil and the commutator is shown assembled,…

"ABC is a horizontal coil of wire terminating at the binding screws a, b. FG is a ring-shaped trough of mercury for the sliding contacts. A wire connects the mercury with the binding screw d. DE is an upright support screwed into a metal base D in connection with the binding screw c, and terminating above in a mercury cup E. When required, DE can be replaced by the shorter supports D'E' and D"E". HLK is a support for a screw L, which carries an adjustible center." — Encyclopedia Britannica, 1893

Electric Apparatus

"ABC is a horizontal coil of wire terminating at the binding screws a, b. FG is a ring-shaped trough…

"A copper wire coiled, by winding it around a piece of wood. The turns of the wire should be close together for actual experiment, they being parted in the figure to show the place of the iron to be magnetized. The best method is, to place the coiled wire, which is called the electrical helix, in a glass tube, the two ends of the wire, of course, projecting. Then placing the body to be magnetized within the folds, send the galvanic influence through the whole by placing the poles of the battery in the cups." —Comstock, 1850

Electrical Helix

"A copper wire coiled, by winding it around a piece of wood. The turns of the wire should be close together…

F, fixed coil; D, movable coil; S, spiral spring; T, Torsion head; MM, Mercury cups; I, Index needle.

Siemens Electrodynamometer

F, fixed coil; D, movable coil; S, spiral spring; T, Torsion head; MM, Mercury cups; I, Index needle.

"This apparatus shows the rotation at once of a magnet and of a movable conductor. The rotating pieces are the magnet sn, which is tied to the copper peg at the bottom of G by means of a piece of string, and swims round the vertical current buoyed up by the mercury in G, and the wire DE, which is hinged to D by a thin flexible wire, and swims round the pole of the vertical magnet n's'." — Encyclopedia Britannica, 1893

Faraday Apparatus

"This apparatus shows the rotation at once of a magnet and of a movable conductor. The rotating pieces…

Diagram of a high-tension ignition system. A is the source of current, usually a batter in earlier days, as indicated by the conventional sign, placed in a primary circuit that also includes the contact maker C, the primary winding of the coil B, and the vibrator G.

High-Tension Ignition System

Diagram of a high-tension ignition system. A is the source of current, usually a batter in earlier days,…

A spirally coiled horn from Virgil's works.

Spirally Coiled Horn

A spirally coiled horn from Virgil's works.

Diagram of a low-tension ignition system. A is the battery, B is a spark coil, and C, D, and E are the elements of a make-and-break device that is mechanically actuated at regular intervals by the motor itself to produce the sparks within the cylinder.

Ignition System

Diagram of a low-tension ignition system. A is the battery, B is a spark coil, and C, D, and E are the…

Four-cylinder low-tension ignition system.

Ignition System

Four-cylinder low-tension ignition system.

"The induction coil is...often called the Rhumkorff coil. Receiving a large current of small electromotive force, it delievers a small current at a high pressure, sometimes hundreds of thousands of volts, i.e., it is a 'step up' transformer." -Avery 1895

Induction Coil

"The induction coil is...often called the Rhumkorff coil. Receiving a large current of small electromotive…

"The induction coil is...often called the Rhumkorff coil. Receiving a large current of small electromotive force, it delievers a small current at a high pressure, sometimes hundreds of thousands of volts, i.e., it is a 'step up' transformer." -Avery 1895

Induction Coil

"The induction coil is...often called the Rhumkorff coil. Receiving a large current of small electromotive…

"Diagram of battery and coil connections for jump spark iginition as applied to a motor cycle." — Hawkins, 1917

Jump start ignition

"Diagram of battery and coil connections for jump spark iginition as applied to a motor cycle." —…

"The connexions of all these six coils are such that when a current is passed through the whole of the coils in series, forces of attraction and repulsion are brought into existence which tend to force one movable coil upwards and the other movable coil downwards." —Encyclopedia Britannica, 1910

Connexions of Kelvin Ampere Balance

"The connexions of all these six coils are such that when a current is passed through the whole of the…

Diagram for locating grounded generator coil with lamp-testing set.

Lamp Testing

Diagram for locating grounded generator coil with lamp-testing set.

Diagram for locating open circuits in field coils with lamp-testing set.

Lamp Testing

Diagram for locating open circuits in field coils with lamp-testing set.

"Salient pole, bipolar field magnet with single coil wound around the yoke." — Hawkins, 1917

Bipolar field magnet

"Salient pole, bipolar field magnet with single coil wound around the yoke." — Hawkins, 1917

"Consequent pole bipolar field magnet with two coils on the core." — Hawkins, 1917

Bipolar field magnet

"Consequent pole bipolar field magnet with two coils on the core." — Hawkins, 1917

"Spiral vessels of the Melon, showing the elastic fibers uncoiled, and the vessels overlapping at their pointed extremities a" — Encyclopedia Britanica, 1893

Melon Fibers

"Spiral vessels of the Melon, showing the elastic fibers uncoiled, and the vessels overlapping at their…

Diagram of set-up when coils are open-circuited.

Open-Circuited

Diagram of set-up when coils are open-circuited.

"The vertebre of serpents are so formed as to admit a great pliancy of the body, which is capable of being coiled up, with the head in the center of the coil, and some serpents have the power of throwing themselves to some distance from this coiled position." — Chambers, 1881

Rattlesnake Skeleton

"The vertebre of serpents are so formed as to admit a great pliancy of the body, which is capable of…

A wiring diagram of Magneto and Coil in the Remy Dual System.

Remy Dual System

A wiring diagram of Magneto and Coil in the Remy Dual System.

"The prey of a serpent is oven thicker than the serpent itself, and to admit of its being swallowed, the throat and body are very dilatable. The bones of the head are adapted to the necessity of a great expansion of the mouth and dilation of the throat." — Chambers, 1881

Serpent Head

"The prey of a serpent is oven thicker than the serpent itself, and to admit of its being swallowed,…

Diagram of set-up when coils are short-circuited.

Short-Circuited

Diagram of set-up when coils are short-circuited.

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

Short-Circuits

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

A hand holding a solenoid.

Solenoid

A hand holding a solenoid.

"Method of winding magnet spool so that the two ends of the coil will come to the outside. This method has also been used for induction coils, where it is desirable to keep the ends of the wire away from the core and primary coil." — Hawkins, 1917

Magnetic spool

"Method of winding magnet spool so that the two ends of the coil will come to the outside. This method…

A long, spiral spring.

Spring

A long, spiral spring.

"Diagram of a vibrator coil. The parts are as follows: A, contact screw; B, battery; C, core; D, vibrator terminal; G, condenser; P, primary winding; S, secondary winding; W, switch; Y, vibrator." -Hawkins, 1917

Vibrator Coil

"Diagram of a vibrator coil. The parts are as follows: A, contact screw; B, battery; C, core; D, vibrator…

"Circuit diagram of a master vibrator coil. B is the battery; C, the unit coils; C1, C2, etc. the condensors; P, the primary windings and S, the secondary windings; H1, H2, etc. the spark plugs; T, the timer; MP, the master primary; V, the vibrator; W, the common primary connection; 1, 2, etc. the stationary contacts of the timer." -Hawkins, 1917

Master Vibrator Coil

"Circuit diagram of a master vibrator coil. B is the battery; C, the unit coils; C1, C2, etc. the condensors;…

Voltmeter test diagram for short-circuit between coils.

Voltmeter

Voltmeter test diagram for short-circuit between coils.

"Core and edge strip winding for shunt field coils of large multipolar dynamo." -Hawkins, 1917

Winding

"Core and edge strip winding for shunt field coils of large multipolar dynamo." -Hawkins, 1917