Lecture 11: Light Intensity And Illumination
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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-11 |
| Location | lines 12574-16484 |
| Status | candidate |
| Word Count | 4890 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 16 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”LECTURE XI. LIGHT INTENSITY AND ILLUMINATION. A. INTENSITY CURVES FOR UNIFORM ILLUMINATION. 102. The distribution of the light flux in space, and thus the illumination, depends on the location of the light sources, and on their distribution curves. The character of the required illumi- nation depends on the purpose for which it is used: a general illumination of low and approximately uniform intensity for street lighting; a general illumination of uniform high intensity in meeting rooms, etc.; a local illumination of fairly high intensity at the reading-table, work bench, etc. ; or combinations thereof, as, in domestic lighting, a general illumination of moderate inten- sity, combined with a local illumination of high intensity. Even the local illumination, however, within the illuminated area usually should be as uniform as possible, and the study of the requirementsSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Radiation / light
Section titled “Radiation / light”LECTURE XI. LIGHT INTENSITY AND ILLUMINATION. A. INTENSITY CURVES FOR UNIFORM ILLUMINATION. 102. The distribution of the light flux in space, and thus the illumination, depends on the location of the light sources, and on their distribution curves. The character of the required illumi- na ...Magnetism
Section titled “Magnetism”LECTURE XI. LIGHT INTENSITY AND ILLUMINATION. A. INTENSITY CURVES FOR UNIFORM ILLUMINATION. 102. The distribution of the light flux in space, and thus the illumination, depends on the location of the light sources, and on their distribution curves. The character of the required illumi- nation depends on the purpose for which it is used: a general illumination of low and approximately uniform intensity fo ...Complex quantities
Section titled “Complex quantities”... 7, of the beam reaching this point, and inversely proportional to the square of the distance I of the point from the effective center of the light source : If the beam of light makes the angle <f> with the vertical direction, the illumination, i, is thus in the direction <j>, the horizontal illumination, that is, the illumination of a horizontal plane (as the surface of a table), is , 7cos< , ih = i cos 0 = 226 LIGHT INTENSITY AND ILLUMINATION. 227 and the vertical illumination, that is, the illumination of a vertical plane (as the sid ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Illumination | 142 | seeded |
| Light | 140 | seeded |
| Radiation | 14 | seeded |
| Brilliancy | 1 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| candle-power | 16 | seeded |
| brilliancy | 1 | seeded |
| flux of light | 1 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
| No chapter-local candidates yet | - | - |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
radiation-light-and-illumination-fig-095 | a horizontal plane P, then, for a point A at the horizontal dis- FIG. 95. tance lh from the lamp, L (that is, the distance lh from the point | line 12627 |
radiation-light-and-illumination-fig-096 | 230 RADIATION, LIGHT, AND ILLUMINATION. FIG. 96. FIG. 97, | line 12973 |
radiation-light-and-illumination-fig-098 | side illumination, and are rounded off where the branches join. FIG. 98. Fig. 99 gives the intensity curves for the same angles, w = 30, | line 13427 |
radiation-light-and-illumination-fig-099 | 45, 60, and 75 deg., for uniform illumination only in the hori- FIG. 99. zontal plane beneath the lamp, but no illumination beyond | line 13434 |
radiation-light-and-illumination-fig-100 | candle power: FIG. 100. I. The direct-current enclosed carbon arc, with clear inner | line 14004 |
radiation-light-and-illumination-fig-101 | 08 0,4 06 08 10 12 It 16 18 20 22 24 26 28 FIG. 101. curve of the character discussed in Fig. 92. III. The magnetite | line 14030 |
radiation-light-and-illumination-fig-102 | 105. With lamps placed at equal distances 4o, and equal FIG. 102. heights lv, as shown diagrammatically in Fig. 102, the illumina- tion of any point A of the street surface is d… | line 14060 |
radiation-light-and-illumination-fig-107 | lamp. Such a distribution curve can, for instance, be produced FIG. 107. by a spiral filament F (Fig. 108) located eccentric in a spher- ical globe G, of which the upper part is… | line 14597 |
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.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Complex quantities: Track how Steinmetz preserves geometric rotation and quadrature while translating the same operation into symbolic form.
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.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
Promotion Checklist
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- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
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