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Diagram showing a method of connecting ammeter to a 300-ampere shunt.

Ammeter

Diagram showing a method of connecting ammeter to a 300-ampere shunt.

A meter used to test batteries.

Ammeter

A meter used to test batteries.

"Hot-wire instruments working on the sag principle can be used in any position if properly contructed, and are very portable." —Encyclopedia Britannica, 1910

Hot-wire Ammeter

"Hot-wire instruments working on the sag principle can be used in any position if properly contructed,…

"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,…

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.

An edgewise switchboard ammeter.

Edgewise Switchboard Ammeter

An edgewise switchboard ammeter.

A galvanometer is a type of ammeter; an instrument for detecting and measuring electric current. It is an analog electromechanical transducer that produces a rotary deflection, through a limited arc, in response to electric current flowing through its coil. The term has been expanded to include uses of the same mechanism in recording, positioning, and servomechanism equipment.

Galvanometer

A galvanometer is a type of ammeter; an instrument for detecting and measuring electric current. It…

"Astatic galvanometer, an instrument which consists of a pair of similar needles magnetized, with their poles turned opposite ways, and stiffly connected at their centers, so that both will swing together." -Whitney, 1911

Astatic Galvanometer

"Astatic galvanometer, an instrument which consists of a pair of similar needles magnetized, with their…

A portable combination volt-ammeter for testing.

Volt-Ammeter

A portable combination volt-ammeter for testing.