gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
190309-1112 EST
Do you know how Edison measured rotating torque in the development of his dynamo? Why did he need to know torque? What else did he need to know besides torque? How did he measure current during this development? Why did he settle on about 110 V for distribution voltage? Why did he invent the 3 wire system with a neutral? When was the Weston d'Arsonval meter developed? How it works, but not when developed is discussed at
https://www.engineersedge.com/instrumentation/electrical_meters_measurement/darsonval_movement.htm
d'Arsonval's story https://en.wikipedia.org/wiki/Jacques-Arsène_d'Arsonval .
Edison had a galvanometer based on the earth's magnetic field.
This discussion https://en.wikipedia.org/wiki/Galvanometer points to 1882 as the invention date of the d'Arsonval movement. Three to four years after Edison's work on the dynamo. Weston's improvements came shortly afterwards. I can't find a date reference for the invention of the DC shunt for current measurement. In Francis Jehl's "Menlo Park Reminiscences" he mentions that they failed to see the obvious, that a shunt could be used to measure current. This somewhat implies that the shunt had not been invented before 1880. Since the d'Arsonval/Weston meter did not occur until after 1882 it is likely the concept of a shunt for current measurement was at or after 1882.
.
Do you know how Edison measured rotating torque in the development of his dynamo? Why did he need to know torque? What else did he need to know besides torque? How did he measure current during this development? Why did he settle on about 110 V for distribution voltage? Why did he invent the 3 wire system with a neutral? When was the Weston d'Arsonval meter developed? How it works, but not when developed is discussed at
https://www.engineersedge.com/instrumentation/electrical_meters_measurement/darsonval_movement.htm
d'Arsonval's story https://en.wikipedia.org/wiki/Jacques-Arsène_d'Arsonval .
Edison had a galvanometer based on the earth's magnetic field.
This discussion https://en.wikipedia.org/wiki/Galvanometer points to 1882 as the invention date of the d'Arsonval movement. Three to four years after Edison's work on the dynamo. Weston's improvements came shortly afterwards. I can't find a date reference for the invention of the DC shunt for current measurement. In Francis Jehl's "Menlo Park Reminiscences" he mentions that they failed to see the obvious, that a shunt could be used to measure current. This somewhat implies that the shunt had not been invented before 1880. Since the d'Arsonval/Weston meter did not occur until after 1882 it is likely the concept of a shunt for current measurement was at or after 1882.
.
