[D8239C], Letter from William Thomson (Lord Kelvin) to Edward Hibberd Johnson, January 2nd, 1882
https://edisondigital.rutgers.edu/document/D8239C
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Metadata
- Title
- [D8239C], Letter from William Thomson (Lord Kelvin) to Edward Hibberd Johnson, January 2nd, 1882
- Editor's Notes
- [copy enclosed with D8239B] Will be glad to see you in Glasgow, making efficiency tests of dynamos with 6.25HP gas engine. Want to test Edison dynamo thoroughly & will give you results or we can do it together. Resis of Siemends SD2 armature is .2 or .21 ohms; field 14 ohms; can bet 110 volts at 1200 rpm. Want to wrap armature (Siemens?) in silk threat and run to 2000 rpm; will 150 or 200 volts destroy insulation? Discusses planned tests. PS. Heard that dynamo Batch showed me in Paris is broken in pieces; would complete silk thread binding prevent such an accident? Should give splendid results if mechanical problems can be overcome.
- Recipient
- Johnson, Edward Hibberd
- Mentioned
- Batchelor, Charles
- Date
- 1882-01-02
- Type
- Letter
- Subject
- Dynamos and generators
- Folder ID
- D8239-F
- Microfilm ID
- 62:654
- Document ID
- D8239C
- Publisher
- Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
- Has Version
- Archive.org Viewer, Microfilm Series Reel 62