Lecture 8: Arc Lamps And Arc Lighting
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Radiation, Light and Illumination |
| Year | 1909 |
| Section ID | radiation-light-and-illumination-lecture-08 |
| Location | lines 7141-8510 |
| Status | candidate |
| Word Count | 8747 |
| Equation Candidates In Section | 86 |
| Figure Candidates In Section | 6 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”LECTURE VIII. ARC LAMPS AND ARC LIGHTING. Volt- Ampere Characteristics of the Arc. 62. The voltage consumed by an arc, at constant current, increases with increase of arc length, and very closely propor- tional thereto. Plotting the arc voltage, e, as function of the 190 180 170 160 150 140 130 120 110 100 00 80 70 60 50 '40 30 20 10 I.fi6 0[5 25 1 0 FIG. 45. arc length, I, we get tor every value of current, i, a practically straight line, as shown for the magnetite arc in Fig. 45, for values of current of 1, 2, 4 and 8 amperes. These lines are steeper 137 138 RADIATION, LIGHT, AND ILLUMINATION. for smaller currents, that is, low-current arcs consume a higher voltage for the same length than high-current arcs, the in-Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Radiation / light
Section titled “Radiation / light”LECTURE VIII. ARC LAMPS AND ARC LIGHTING. Volt- Ampere Characteristics of the Arc. 62. The voltage consumed by an arc, at constant current, increases with increase of arc length, and very closely propor- tional thereto. Plotting the arc voltage, e, as function of the 190 180 170 160 150 140 130 120 ...Impedance / reactance
Section titled “Impedance / reactance”... by the arc and the steadying device increases with increase of current, and pulsations of current thus limit themselves. All arc lamps for use on constant voltage supply thus contain a sufficiently high steadying resistance, or, in alternating-current circuits, a steadying reactance. Arc lamps for use on constant-current circuits, that is, cir- cuits in which the current is kept constant by the source of power supply, as the constant-current transformer or the arc machine, require no steadying resistance or reactance. 152 RADIATION, LIGHT, AND ILLUM ...Alternating current
Section titled “Alternating current”LECTURE VIII. ARC LAMPS AND ARC LIGHTING. Volt- Ampere Characteristics of the Arc. 62. The voltage consumed by an arc, at constant current, increases with increase of arc length, and very closely propor- tional thereto. Plotting the arc voltage, e, as function of the 190 180 170 160 150 140 130 120 110 100 00 80 70 60 50 ...Field language
Section titled “Field language”... t of the constant-current transformer to direct current without requiring moving machinery. The Brush machine in its principle essentially is a quarter- phase constant-current alternator with rectifying commutator. An alternator of low armature reaction and strong magnetic field regulates for constant potential: the change of armature reaction, resulting from a change of load, has little effect on the field and thereby on the terminal voltage, if the armature reaction is low. An alternator of very high armature reaction and weak field, however, regu ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Light | 80 | seeded |
| Arc lamp | 49 | seeded |
| Radiation | 18 | seeded |
| Illumination | 17 | seeded |
| Ether | 5 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| ether | 5 | seeded |
| candle-power | 1 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
radiation-light-and-illumination-eq-candidate-0190 | 62. The voltage consumed by an arc, at constant current, | line 7147 |
radiation-light-and-illumination-eq-candidate-0191 | intersect in a point which lies at I = — 0.125 cm. = — 0.05 in. | line 7199 |
radiation-light-and-illumination-eq-candidate-0192 | and e = 30 volts; that is, the voltage consumed by the arc | line 7200 |
radiation-light-and-illumination-eq-candidate-0193 | consists of a part, e0 = 30 (for the magnetite arc), which is con- | line 7201 |
radiation-light-and-illumination-eq-candidate-0194 | the arc length plus a small quantity, 1L= 0.125 (for the magne- | line 7209 |
radiation-light-and-illumination-eq-candidate-0195 | tite arc): e^ = (l + 0.125), and depends upon the current, | line 7210 |
radiation-light-and-illumination-eq-candidate-0196 | magnetite arc, for I = 0.3, 1.25, 2.5, 3.75 cm. = 0.125, 0.5, 1 and | line 7220 |
radiation-light-and-illumination-eq-candidate-0197 | stant part, e0 = 30 volts, which apparently represents the | line 7222 |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
radiation-light-and-illumination-fig-045 | 1 0 FIG. 45. arc length, I, we get tor every value of current, i, a practically straight line, as shown for the magnetite arc in Fig. 45, for values | line 7181 |
radiation-light-and-illumination-fig-047 | 1J5 IN. FIG. 47. lengths, however, the observed values of voltage drop below the straight line, as shown in Fig. 47, and converge towards a | line 7364 |
radiation-light-and-illumination-fig-049 | arc. Thus comparing in Fig. 49 a 1-in. carbon arc A with a FIG. 49. 0.5-in. carbon arc B, the former requires, at 5 amperes, 112 volts and 560 watts, the latter only 84 volts an… | line 7635 |
radiation-light-and-illumination-fig-050 | 154 RADIATION, LIGHT, AND ILLUMINATION. FIG. 50. FIG. 51a. | line 7964 |
radiation-light-and-illumination-fig-052 | 70. With the luminous arc, in which the light is proportional FIG. 52. 158 | line 8127 |
radiation-light-and-illumination-fig-054 | \r FIG. 54. ous height follow each other. Thus with an average arc volt- age of 75, momentary peaks of 85 volts will probably be reached | line 8224 |
Hidden-Gem Quote Candidates
Section titled “Hidden-Gem Quote Candidates”| Candidate ID | Candidate Passage | Source Location |
|---|---|---|
| No chapter-local candidates yet | - | - |
Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- Field language: Field-pressure or field-gradient interpretations can be explored here only after the explicit source passage and modern engineering translation are kept distinct.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
Promotion Checklist
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
- Verify the chapter boundary and surrounding context.
- Promote exact quotations only after checking the source image.
- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
- Move diagram candidates into the diagram archive only after image extraction, crop verification, and manifest creation.
- Keep Steinmetz wording, modern translation, and ether-field interpretation in separate labeled layers.