[N326012], Technical Note, Ezra Torrance Gilliland, John F Ott, September 2nd, 1886
https://edisondigital.rutgers.edu/document/N326012
PDF: Archive.org
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Metadata
- Title
- [N326012], Technical Note, Ezra Torrance Gilliland, John F Ott, September 2nd, 1886
- Editor's Notes
- "Tested carbon made of pith talks about same as hand telephone is very light so much so that when cap is removed from the top of transmitter and when speaking in a loud tone of voice the carbon will pour out of the holes in the Electrodce rising up 1/2 of an inch like water out of a fountain we find well convinced that light carbon is not as good as the heavier or at least heavy enough to fall back into position so as to respond to rapid vibrations and not be thrown up and held suspended in space= heated carbon made from imported liquorice slight improvement over domestic liquorice but does not compare to standard carbon-- Coil in Vacuum [drawing] Description arrangement of coil in vacuum shown on page 13 AA secondary connections or leading in series of primary current of coil-- BB ditto for primary C coil D Glass tube FF Hard rubber rings to hold coil in position in tube-- E opening in coil for exhausting the air-- The quality of the anthracite coal used to make the Standard Telephone Carbon has been having been taken from the supply of coal furnished for steam purposes-- Suggest processing of highest quality of anthracite coal let it be hard and glassy and presume the quality of carbon will be greatly improved
- Date
- 1886-09-02
- Type
- Technical Note
- Subject
- Telephone
- Folder ID
- N326-F
- Microfilm ID
- 43:821
- Document ID
- N326012
- Publisher
- Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
- Has Version
- Archive.org Viewer, Microfilm Series Reel 43
- Item sets
- [N326-F] N-86-08-25 (1886)