[D8939ABZ1], Essay, John Trumbull Marshall, 1889
https://edisondigital.rutgers.edu/document/D8939ABZ1
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- Title
- [D8939ABZ1], Essay, John Trumbull Marshall, 1889
- Editor's Notes
- East Newark, N.J.,####When a hydrocarbon gas is passed fully through a tube which is at first cold and gradually brought to a high heat, the gas at the outlet is at first colorless, and as the temperature rises, passes successively through pale blue, while, yellow, brown, black and colorless.####[Deposition?] begins when the gas at the outlet is changing from blue to white, and contributes to deposit shiny carbon until the gas at the outlet is a deep yellow. The deposit after that is dull and coarse.####When the gas at the outlet is black, everything in the tube becomes coated with a soft dull black deposit, and when it is colorless, the whole of the carbon seems to be deposited in the form of lamp black which falls to the lowe side of the tube.####When the hydrocarbon is diluted with a gas in which it does not firm, [----] deposition may take place at a higher actual temperature than in undiluted gas but even then the color of the gas at the outlet indicates the style of deposit the same as with the undiluted gas.####Carbons, deposited at the lowest temperature at which they will deposit, are not so good in economy as these deposited near the upper limit of clean deposition. For instance: 111 volt carbons heated, at the lowest temperature at which deposition take place, down to 90 volts, will not be of so good economy as the same carbons heated to 90 volts, at the upper limit of clean deposition.####Rough coarse deposit gives low volts and poor life.####The best temperature seems to be such as gies a slight yellowish tinge to the gas at the outlet.####There is no difficulty in making fine looking carbons, every time, in any quantity.####Hydrocarbons that are not notable at ordinary temperatures, may be used for deposition in the following way!####[----] in the letters of an iron tube, a small quantity of the hydrocarbon: Have it suspend the carbons, [----] a cap on the top of the tube as light as it is safe to have it and allow the gas formed to escapte- then force the tube with the hot fire of a pot stove or furnace.####Or they may be used for deposition in larger quantities in the following way: Take a large iron tube, closed at one end, and slip into it a sheet iron box divided into compartments into which the carbons are placed: in the compartment nearest the closed end of the tube, do not put any carbons, but a small quantity of hydrobarbon: Cork the open end of the tube and stick the closed end horizontally into the furnace. In this way, paraffim beeswax, camphor, linseed oil, soft coal, carbon, [caontcone?] &c may be successfully used.####There seems to be no difficulty in making 16 candle lamps to give uniformly good economy and life, but the 10 candle lamps lose a large part of this deposit in the [pump?] room.####Lamps heated in this way lose their candle power rather [------] than regulars.####All attempts have so far failed to deposit carbons with carbon [de?] sulphiphids.####J.T. Marshall####[name mentions: J.T. Marshall]
- Supplied year
- Author
- Marshall, John Trumbull
- Date
- 1889-00-00
- Type
- Essay
- Subject
- Carbon, coal, glass, ceramics
- Incandescent lamp
- Chemicals, chemical products, and chemical processes
- Folder ID
- D8939-F
- Microfilm ID
- 126:548
- Document ID
- D8939ABZ1
- Publisher
- Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
- Has Version
- Archive.org Viewer, Microfilm Series Reel 126