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- Siemens & Halske Duncan Type A Wattmeter, 1899-1900 - In the late 1800s, companies that supplied electricity to consumers developed wattmeters to measure how much power customers used so they could charge appropriate usage rates. Thomas Duncan created wattmeters bearing his name for several companies in the late 1890s. Duncan worked for the American branch of the German company Siemens & Halske beginning in 1899 before starting his own meter manufacturing business in 1901.
- 1899-1900
- Collections - Artifact
Siemens & Halske Duncan Type A Wattmeter, 1899-1900
In the late 1800s, companies that supplied electricity to consumers developed wattmeters to measure how much power customers used so they could charge appropriate usage rates. Thomas Duncan created wattmeters bearing his name for several companies in the late 1890s. Duncan worked for the American branch of the German company Siemens & Halske beginning in 1899 before starting his own meter manufacturing business in 1901.
- Siemens & Halske Wall Telephone, 1880-1915 -
- 1880-1915
- Collections - Artifact
Siemens & Halske Wall Telephone, 1880-1915
- German Field Telephone, circa 1915 -
- circa 1915
- Collections - Artifact
German Field Telephone, circa 1915
- Siemens & Halske Telephone, 1880-1915 -
- 1880-1915
- Collections - Artifact
Siemens & Halske Telephone, 1880-1915
- Two Magneto Desk Stand Telephone, 1910-1919 -
- 1910-1919
- Collections - Artifact
Two Magneto Desk Stand Telephone, 1910-1919
- Siemens & Halske Telephone Receiver, 1880-1915 -
- 1880-1915
- Collections - Artifact
Siemens & Halske Telephone Receiver, 1880-1915
- Siemens & Halske Tantalum Lamp, 1908 -
- 1908
- Collections - Artifact
Siemens & Halske Tantalum Lamp, 1908
- Desk Stand Telephone, 1910-1919 -
- 1910-1919
- Collections - Artifact
Desk Stand Telephone, 1910-1919
- Siemens & Halske Duncan Type A Wattmeter, 1899-1900 - In the late 1800s, companies that supplied electricity to consumers developed wattmeters to measure how much power customers used so they could charge appropriate usage rates. Thomas Duncan created wattmeters bearing his name for several companies in the late 1890s. Duncan worked for the American branch of the German company Siemens & Halske beginning in 1899 before starting his own meter manufacturing business in 1901.
- 1899-1900
- Collections - Artifact
Siemens & Halske Duncan Type A Wattmeter, 1899-1900
In the late 1800s, companies that supplied electricity to consumers developed wattmeters to measure how much power customers used so they could charge appropriate usage rates. Thomas Duncan created wattmeters bearing his name for several companies in the late 1890s. Duncan worked for the American branch of the German company Siemens & Halske beginning in 1899 before starting his own meter manufacturing business in 1901.
- Siemens & Halske Telephone Receiver, 1880-1915 -
- 1880-1915
- Collections - Artifact
Siemens & Halske Telephone Receiver, 1880-1915