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- Westinghouse Type TL Ammeter, circa 1911 - In the late 1800s and early 1900s, companies that supplied electricity to consumers needed a variety of instruments to regulate and monitor electrical output. These instruments were vital to the operation of power stations and needed to be accurate and rugged. Ammeters--used to measure the current in a circuit--could be found on switchboards or connected to motors and generators.
- circa 1911
- Collections - Artifact
Westinghouse Type TL Ammeter, circa 1911
In the late 1800s and early 1900s, companies that supplied electricity to consumers needed a variety of instruments to regulate and monitor electrical output. These instruments were vital to the operation of power stations and needed to be accurate and rugged. Ammeters--used to measure the current in a circuit--could be found on switchboards or connected to motors and generators.
- Westinghouse Type C Switchboard Wattmeter, 1906-1911 - In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- 1906-1911
- Collections - Artifact
Westinghouse Type C Switchboard Wattmeter, 1906-1911
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- Thomson-Houston Current Indicator, 1889-1892 -
- 1889-1892
- Collections - Artifact
Thomson-Houston Current Indicator, 1889-1892
- General Electric Thomson Type T High Torque Meter, circa 1907 -
- circa 1907
- Collections - Artifact
General Electric Thomson Type T High Torque Meter, circa 1907
- Westinghouse Round Type Wattmeter, 1902 - In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- 1902
- Collections - Artifact
Westinghouse Round Type Wattmeter, 1902
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- Sangamo Electric Company Type F Wattmeter, circa 1910 - In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used--and then charge them accordingly. Induction-type wattmeters proved reliable and would become the industry standard, but until 1910 Westinghouse held the patents. Sangamo Electric Company, which had not been granted a license from Westinghouse, produced this mercury-motor alternative.
- circa 1910
- Collections - Artifact
Sangamo Electric Company Type F Wattmeter, circa 1910
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used--and then charge them accordingly. Induction-type wattmeters proved reliable and would become the industry standard, but until 1910 Westinghouse held the patents. Sangamo Electric Company, which had not been granted a license from Westinghouse, produced this mercury-motor alternative.
- Westinghouse Round Type Wattmeter, circa 1903 - In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- circa 1903
- Collections - Artifact
Westinghouse Round Type Wattmeter, circa 1903
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used -- and then charge them accordingly. Inventive electrical engineers developed various methods to measure electric power. Induction meters that employed magnetic fields to rotate a disc or cylinder to register energy usage would become the standard. Continued improvements made these wattmeters more compact and reliable.
- Westinghouse Voltmeter, circa 1903 -
- circa 1903
- Collections - Artifact
Westinghouse Voltmeter, circa 1903
- Westinghouse Shallenberger Ampere-hour Meter, 1890-1897 - Oliver B. Shallenberger, chief electrician at Westinghouse, invented the first successful AC ampere-hour meter in 1888. This meter measures the flow of electric current through a circuit. Early meters like this helped companies that supplied electricity to customers monitor usage and charge appropriate rates. Shallenberger's meter also paved the way for the acceptance of AC power distribution.
- 1890-1897
- Collections - Artifact
Westinghouse Shallenberger Ampere-hour Meter, 1890-1897
Oliver B. Shallenberger, chief electrician at Westinghouse, invented the first successful AC ampere-hour meter in 1888. This meter measures the flow of electric current through a circuit. Early meters like this helped companies that supplied electricity to customers monitor usage and charge appropriate rates. Shallenberger's meter also paved the way for the acceptance of AC power distribution.
- Elektron Manufacturing Company Double Pole Main Electric Switch, circa 1889 - Switches open or close an electrical circuit to turn things off or on. In the late 1800s and early 1900s, knife switches were commonly found in engine or generating rooms, connected to factory motors, or mounted on a building's power and lighting switchboard. Operators pushed the hinged, metal blades into the switch's jaws to send electricity to where it was needed.
- circa 1889
- Collections - Artifact
Elektron Manufacturing Company Double Pole Main Electric Switch, circa 1889
Switches open or close an electrical circuit to turn things off or on. In the late 1800s and early 1900s, knife switches were commonly found in engine or generating rooms, connected to factory motors, or mounted on a building's power and lighting switchboard. Operators pushed the hinged, metal blades into the switch's jaws to send electricity to where it was needed.