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- Westinghouse Type A 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 Type A 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.
- Mercury V-8 Gasoline Mileage Test Car at Ford Dealership, Jackson, Michigan, 1940 - Used car sales took off in the 1930s as frugal car buyers looked for deals. This photograph from 1940 shows a Jackson, Michigan, dealer's display window advertising the "Hottest Spot in Town for Used Car Bargains."
- March 27, 1940
- Collections - Artifact
Mercury V-8 Gasoline Mileage Test Car at Ford Dealership, Jackson, Michigan, 1940
Used car sales took off in the 1930s as frugal car buyers looked for deals. This photograph from 1940 shows a Jackson, Michigan, dealer's display window advertising the "Hottest Spot in Town for Used Car Bargains."
- Duncan Model E Wattmeter, 1925-1930 - In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used--and then charge them accordingly. Thomas Duncan developed wattmeters for several companies before starting his own meter manufacturing business in 1901. Duncan came out with the Model E in 1908 and produce it over the next several decades.
- 1925-1930
- Collections - Artifact
Duncan Model E Wattmeter, 1925-1930
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used--and then charge them accordingly. Thomas Duncan developed wattmeters for several companies before starting his own meter manufacturing business in 1901. Duncan came out with the Model E in 1908 and produce it over the next several decades.
- General Electric Thomson Polyphase Meter, 1899-1905 -
- 1899-1905
- Collections - Artifact
General Electric Thomson Polyphase Meter, 1899-1905
- Westinghouse Type C Switchboard Wattmeter, 1906-1911 -
- 1906-1911
- Collections - Artifact
Westinghouse Type C Switchboard Wattmeter, 1906-1911
- Fort Wayne Type W Wattmeter, circa 1905 - 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 1905
- Collections - Artifact
Fort Wayne Type W Wattmeter, circa 1905
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.
- Seth Thomas Clock Company Clock Used with a Maryland Meter Works Gas Complaint Meter, circa 1920 -
- circa 1920
- Collections - Artifact
Seth Thomas Clock Company Clock Used with a Maryland Meter Works Gas Complaint Meter, circa 1920
- Fort Wayne Type K Wattmeter, 1899-1901 - 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.
- 1899-1901
- Collections - Artifact
Fort Wayne Type K Wattmeter, 1899-1901
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.
- Fort Wayne Type K Switchboard Wattmeter, 1899-1910 -
- 1899-1910
- Collections - Artifact
Fort Wayne Type K Switchboard Wattmeter, 1899-1910
- Insulator with Bracket, Used on First Telegraph Line in Michigan, 1854 -
- 1854
- Collections - Artifact
Insulator with Bracket, Used on First Telegraph Line in Michigan, 1854