ClipArt ETC
A meter used to test batteries.

Ammeter

A meter used to test batteries.

Illustration comparing the fundamental units of measure 1 cubic yard and 1 cubic meter.

Comparison Of Units Of Cubic Measure

Illustration comparing the fundamental units of measure 1 cubic yard and 1 cubic meter.

This is the instrument used for measuring the electrical potential difference between two points in an electric circuit.

Instrument for Testing Batteries

This is the instrument used for measuring the electrical potential difference between two points in…

Any of various measuring instruments for measuring a quantity

General Purpose Meter

Any of various measuring instruments for measuring a quantity

This is a parking meter recorder sheet, where a meter officer can record violations and log times for multiple vehicles/guests.

Meter Record

This is a parking meter recorder sheet, where a meter officer can record violations and log times for…

The Ohmer fare register was, in various models, a mechanical device for registering and recording the fares of passengers on streetcars, busses and taxis in the early 20th century. It was invented and improved by members and employees of the Ohmer family of Dayton, Ohio. This latter company employed up to 9,000 people at one time and was a major manufacturer of precision equipment during World War 1.

Ohmer Fare Register

The Ohmer fare register was, in various models, a mechanical device for registering and recording the…

A device that measures the instantaneous speed of a land vehicle.

Multiple Use Speedometer

A device that measures the instantaneous speed of a land vehicle.

Illustration comparing the fundamental units of measure 1 square yard and 1 square meter.

Comparison Of Units Of Square Measure

Illustration comparing the fundamental units of measure 1 square yard and 1 square meter.

A volt-meter in a circuit.

Volt meter

A volt-meter in a circuit.

"Instrument designed to measure both the rate at which the electrical energy is delivered and the time that it is delivered, i.e., the number of watt-hours." -Avery 1895

Wattmeter

"Instrument designed to measure both the rate at which the electrical energy is delivered and the time…