Lecture 10: Light Flux And Distribution
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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-10 |
| Location | lines 9389-12573 |
| Status | candidate |
| Word Count | 7958 |
| Equation Candidates In Section | 10 |
| Figure Candidates In Section | 25 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”LECTURE X. LIGHT FLUX AND DISTRIBUTION. 86. The light flux of an illuminant is its total radiation power, in physiological measure. It therefore is the useful output of the illuminant, and the efficiency of an illuminant thus is the ratio of the total light flux divided by the power input. In general, the distribution of the light flux throughout space is not uniform, but the light-flux density is different in different directions from an illuminant. Unit light-flux density is the light-flux density which gives the physiological effect of one candle at unit distance. The unit of light flux, or the lumen, is the light flux passing through unit surface at unit light-flux density. The unit of light inten- sity, or one candle, thus gives, if the light-flux distribution is uniform in all directions, unit fluxSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Radiation / light
Section titled “Radiation / light”LECTURE X. LIGHT FLUX AND DISTRIBUTION. 86. The light flux of an illuminant is its total radiation power, in physiological measure. It therefore is the useful output of the illuminant, and the efficiency of an illuminant thus is the ratio of the total light flux divided by the power input. ...Magnetism
Section titled “Magnetism”LECTURE X. LIGHT FLUX AND DISTRIBUTION. 86. The light flux of an illuminant is its total radiation power, in physiological measure. It therefore is the useful output of the illuminant, and the efficiency of an illuminant thus is the ratio of the total light flux divided by the power input. In ...Complex quantities
Section titled “Complex quantities”... IBUTION. 187 The distribution of light flux or of intensity is never uniform, and the investigation of intensity distribution of the light flux thus necessary. The distribution of the light intensity of an illuminant de- pends upon the shape of the radiator and upon the objects surrounding it; that is, the distribution of the light flux issuing from the radiator depends on the shape of the radiator, but is more or less modified by shadows cast by surrounding objects, by refraction, diffraction, diffusion in surrounding objects, etc. The most c ...Field language
Section titled “Field language”... 5.44 4.88 4.98 90 0 0.75 1.37 2.00 5.51 4.94 4.94 100 0.39 1.00 110 0 09 0 07 120 0 0.04 130 0 02 140 0 005 150 0 77. SHADOWS. 93. The radiator of an illuminant can rarely be arranged so that no opaque bodies exist in its field of light flux and obstruct some light, that is, cast shadows. As the result of shadows, the distribution of intensity of the illuminant differs more or less from that of its radiator, and the total light flux is less. The most common form of shadow is the round shadow sym- ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Light | 205 | seeded |
| Radiation | 24 | seeded |
| Illumination | 21 | seeded |
| Brilliancy | 15 | seeded |
| Arc lamp | 7 | seeded |
| Refraction | 4 | seeded |
| Ether | 1 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| brilliancy | 15 | seeded |
| flux of light | 4 | seeded |
| candle-power | 1 | seeded |
| ether | 1 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
radiation-light-and-illumination-eq-candidate-0291 | 4 it lumens (since the area at unit distance from a point is the | line 9409 |
radiation-light-and-illumination-eq-candidate-0292 | the downward beam would be given by (f> = 0, the horizontal | line 9472 |
radiation-light-and-illumination-eq-candidate-0293 | beam by ^ = 90 deg., and the upward beam by <j> = 180 deg. | line 9473 |
radiation-light-and-illumination-eq-candidate-0294 | (<£ = 90 deg.) covers a zone of 2 rn circumference, while the | line 9497 |
radiation-light-and-illumination-eq-candidate-0295 | intensity in any other direction (f> covers a zone of 2 rn sin <j> | line 9498 |
radiation-light-and-illumination-eq-candidate-0296 | dA = 2 n sin | line 9546 |
radiation-light-and-illumination-eq-candidate-0297 | = 27r/sin<M^ | line 9556 |
radiation-light-and-illumination-eq-candidate-0298 | <£ = 2 TT / /sin (f>d(/>. | line 9559 |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
radiation-light-and-illumination-fig-062 | is: FIG. 62. = 27r/sin<M^ | line 9553 |
radiation-light-and-illumination-fig-064 | 192 RADIATION, LIGHT, AND ILLUMINATION. FIG. 64. FIG. 65. | line 9724 |
radiation-light-and-illumination-fig-065 | FIG. 64. FIG. 65. FIG. 66. | line 9727 |
radiation-light-and-illumination-fig-066 | FIG. 65. FIG. 66. LIGHT FLUX AND DISTRIBUTION. 193 | line 9730 |
radiation-light-and-illumination-fig-067 | direction. FIG. 67. Straight Line or Cylindrical Radiator. | line 9851 |
radiation-light-and-illumination-fig-068 | 24 deg. above the horizontal, or in the space between a and a’ in Fig. 68. It is interesting to compare the three radiators, (1), (2), and (5), on the basis of equal maximum int… | line 9930 |
radiation-light-and-illumination-fig-070 | > FIG. 70. FIG. 71. | line 10274 |
radiation-light-and-illumination-fig-071 | FIG. 70. FIG. 71. In Fig. 72 is plotted the intensity distribution in the meridian | line 10277 |
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.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
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.
- 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.
- Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
Promotion Checklist
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
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