US533932A - Carbon for arc lamps - Google Patents
Carbon for arc lamps Download PDFInfo
- Publication number
- US533932A US533932A US533932DA US533932A US 533932 A US533932 A US 533932A US 533932D A US533932D A US 533932DA US 533932 A US533932 A US 533932A
- Authority
- US
- United States
- Prior art keywords
- carbon
- lamps
- arc lamps
- core
- inner core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title description 14
- 229910052799 carbon Inorganic materials 0.000 title description 14
- 229910021385 hard carbon Inorganic materials 0.000 description 4
- LTMHDMANZUZIPE-PUGKRICDSA-N digoxin Chemical compound C1[C@H](O)[C@H](O)[C@@H](C)O[C@H]1O[C@@H]1[C@@H](C)O[C@@H](O[C@@H]2[C@H](O[C@@H](O[C@@H]3C[C@@H]4[C@]([C@@H]5[C@H]([C@]6(CC[C@@H]([C@@]6(C)[C@H](O)C5)C=5COC(=O)C=5)O)CC4)(C)CC3)C[C@@H]2O)C)C[C@@H]1O LTMHDMANZUZIPE-PUGKRICDSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B31/00—Electric arc lamps
- H05B31/02—Details
- H05B31/06—Electrodes
- H05B31/08—Carbon electrodes
- H05B31/10—Cored carbon electrodes
Definitions
- n1 mums Pncns co, woroumu. WASHINGTON, u. c.
- My invention relates to the carbon electrodes for are lamps; and has for its object to provide a simple means of preventing overloading of dynamos or transformers by excess- With alternating current are lamps it has been found imperative to use the so-called cored carbons having a cylindrical shell of hard carbon and an inner core of softmaterial readily volatilized. When this core extends into the tip of the carbon it volatilizes very easily when the current is first turned on, as it forms the principal conducting path,.and the body of heated gas thus formed reduces the resistance of the are so greatly that where many lamps are turned on at once, it is a frequent source of overload to the generator, although it may be capable of running the lamps readily after they have once been started.
- FIG. 1 is a side elevation, partly in secstructed.
- Fig. 2 is a similar view of a carbon constructed according to my invention, and
- Fig. 3 is a View, showing a modification.
- A is the outer shell of hard carbon
- B In Fig. 2 C is a circular cup bored out of the end of the carbon, which has the effect of preventing the too great volitalization of the oored part on starting.
- the object of my invention is to approximate in the initial shape of the carbon the form which it will have after being in use or after burning for a considerable time.
- the core being soft will burn away into a deep cup and in my invention I form this deep cup by mechanical means, removing that part of the core, or a little more than it, which would be removed in the first burning of the new car- 55 bon not prepared as above described.
- a carbon for are lamps, comprising an outer cas- 7 ing or shellof hard carbon, and an inner core of softer material, the inner core being cut away from the tip of the electrode, substantially as described.
- a carbon electrode for an arc lamp comprising an outer shell of hard carbon and an inner core of softer material, the electrode having a cup at its tip, whereby the inner core is cut away from the end of the carbon.
Landscapes
- Radiation-Therapy Devices (AREA)
Description
.(No Model.)
' E. THOMSON.
CARBON FOR ARC LAMPS.
Patented Feb. 12, 1895..
n1: mums Pncns co, woroumu. WASHINGTON, u. c.
UNIT D STATES PATENT OFFICE.
. ELIHU THOMSON, OF SWAMPSCOTT, ASSIGNOR TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF BOSTON, MASSACHUSETTS.
' of Which the following is a specification.
' tion, of a cored carbon as ordinarily conis the core.
ive current in such lamps at starting.
ARC LAMPS.
SPECIFICATION forming part of Letters Patent No. 533,932, dated February 12, 1 895.
Application filed November 26,1894. Serial No. 529,913. (No model.)
To all whom it may concern:
Be it known that I, ELIHU THOMSON, a citizen of the United States, residing at Swampscott, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Carbons forArc Lamps,
My invention. relates to the carbon electrodes for are lamps; and has for its object to provide a simple means of preventing overloading of dynamos or transformers by excess- With alternating current are lamps it has been found imperative to use the so-called cored carbons having a cylindrical shell of hard carbon and an inner core of softmaterial readily volatilized. When this core extends into the tip of the carbon it volatilizes very easily when the current is first turned on, as it forms the principal conducting path,.and the body of heated gas thus formed reduces the resistance of the are so greatly that where many lamps are turned on at once, it is a frequent source of overload to the generator, although it may be capable of running the lamps readily after they have once been started. It is a remedy for this trouble which forms the object of my invention, and this I attain by boring out the core or end of the carbon before it is inserted in thelamp, thus bringing the hard parts of the carbon together. The lamps thus start with approximately normalcurrent and the dynamos are not overloaded.
An illustration-of my invention is shown in the accompanying drawings, in which Figure l is a side elevation, partly in secstructed. Fig. 2 is a similar view of a carbon constructed according to my invention, and Fig. 3 is a View, showing a modification.
, A is the outer shell of hard carbon, and B In Fig. 2, C is a circular cup bored out of the end of the carbon, which has the effect of preventing the too great volitalization of the oored part on starting.
form ordinarily taken by the carbon after the point or cone E has been burned away.
It is of course immaterial what form of carbon is employed in the practice of my invention, it being only necessary that the end of it should be formed with the little cup, for the 5 purpose set out. p
The object of my invention is to approximate in the initial shape of the carbon the form which it will have after being in use or after burning for a considerable time. The core being soft will burn away into a deep cup and in my invention I form this deep cup by mechanical means, removing that part of the core, or a little more than it, which would be removed in the first burning of the new car- 55 bon not prepared as above described.
What I claim as new, and desire to secure by Letters Patent of the United States, is-
1. The method of preventing excess of current at starting in arc lamps employing cored 7o 'carbons, which consists in removing the core fora short distance from the tip of the carbon, substantially as described.
2. As a new article of manufacture, a carbon for are lamps, comprising an outer cas- 7 ing or shellof hard carbon, and an inner core of softer material, the inner core being cut away from the tip of the electrode, substantially as described.
3. As a new article of manufacture, a carbon electrode for an arc lamp, comprising an outer shell of hard carbon and an inner core of softer material, the electrode having a cup at its tip, whereby the inner core is cut away from the end of the carbon. I
In witness whereof I have hereunto set my hand this 23d day of November, 1894.
ELIHU THOMSON.
Witnesses:
JOHN W. GIBBONEY, DANIEL B. GAUOHET.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US533932A true US533932A (en) | 1895-02-12 |
Family
ID=2602696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US533932D Expired - Lifetime US533932A (en) | Carbon for arc lamps |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US533932A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3171017A (en) * | 1959-01-16 | 1965-02-23 | Edwards High Vacuum Ltd | Evaporation of metal or metalloids |
| US20040100228A1 (en) * | 2002-11-26 | 2004-05-27 | Blackburn Scott Evart | Current response controller for starter/alternator |
-
0
- US US533932D patent/US533932A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3171017A (en) * | 1959-01-16 | 1965-02-23 | Edwards High Vacuum Ltd | Evaporation of metal or metalloids |
| US20040100228A1 (en) * | 2002-11-26 | 2004-05-27 | Blackburn Scott Evart | Current response controller for starter/alternator |
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