Illumination
Steinmetz Context
Section titled “Steinmetz Context”In this source, illumination is not just light output. It is radiation, visibility, photometry, distribution, room geometry, fatigue, shadows, brilliancy, and physiology.
Modern Equivalent
Section titled “Modern Equivalent”Lighting engineering, photometry, luminous flux, illuminance, luminance, visual comfort, and lighting design.
Why It Matters
Section titled “Why It Matters”It shows Steinmetz treating engineering as a relation between physical systems and human perception.
Source-Grounded Dossier
Section titled “Source-Grounded Dossier”Generated evidence layer: this dossier is built from the processed concept concordance. Counts and snippets are OCR/PDF-text aids, not final quotations. Verify against scans before making exact claims.
Candidate occurrences tracked for this page.
Sources with at least one hit.
Sections, lectures, chapters, or report divisions to review.
What The Current Corpus Shows
Section titled “What The Current Corpus Shows”Read this concept page through the linked source passages first. Use the dossier to locate Steinmetz’s wording, then add modern, mathematical, historical, and interpretive layers only with labels.
The strongest current source concentration is Radiation, Light and Illumination with 2488 candidate hits across 33 sections.
The dossier is meant to turn a concept page into a research workbench: begin with Steinmetz’s source wording, then add modern interpretation, mathematical reconstruction, historical context, and any ether-field reading as separate layers.
Terms And Aliases Tracked
Section titled “Terms And Aliases Tracked”Illumination, candle power, candle-power, illuminant, illuminants, illuminating, illumination, Light, light, luminous, visible light, Photometry, photometer, photometers, photometric, photometry, Light flux density, light-flux-density
Concordance Records
Section titled “Concordance Records”Illumination - Light - Photometry - Light flux density
Source Distribution
Section titled “Source Distribution”| Source | Candidate Hits | Sections | Concepts represented |
|---|---|---|---|
| Radiation, Light and Illumination | 2488 | 33 | Illumination, Light, Light flux density, Photometry |
| General Lectures on Electrical Engineering | 496 | 18 | Illumination, Light, Photometry |
| Four Lectures on Relativity and Space | 154 | 4 | Light |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 24 | 9 | Light |
| Theory and Calculation of Electric Circuits | 19 | 6 | Illumination, Light |
| Theoretical Elements of Electrical Engineering | 16 | 8 | Light |
| Theory and Calculation of Electric Apparatus | 16 | 8 | Illumination, Light |
| Theory and Calculation of Alternating Current Phenomena | 15 | 10 | Light |
Priority Passages To Read
Section titled “Priority Passages To Read”Lecture 12: Illumination And Illuminating Engineering - 521 candidate hits
Source: Radiation, Light and Illumination (1909)
Location: lines 16485-17445 - Tracked concepts: Illumination, Light, Light flux density, Photometry
Open source text - Open chapter workbench
LECTURE XII. ILLUMINATION AND ILLUMINATING ENGINEERING. 110. Artificial light is used for the purpose of seeing and distinguishing objects clearly and comfortably when the day- light fails. The problem of artificial lighting thus comprises con- sideration of the source of light o ...LECTURE XII. ILLUMINATION AND ILLUMINATING ENGINEERING. 110. Artificial light is used for the purpose of seeing and distinguishing objects clearly and comfortably when the day- light fails. The problem of artificial lighting thus comprises con- sideration of the source of light or the illuminant; ...Lecture 17: Arc Lighting - 402 candidate hits
Source: General Lectures on Electrical Engineering (1908)
Location: lines 9920-12795 - Tracked concepts: Illumination, Light, Photometry
Open source text - Open chapter workbench
... ved. So far only three materials have been found, which in luminous arcs give efficiences vastly superior to incandescence : mercury, calcium (lime), and titanium. All (three even in moderate sized units, give efficiencies of one-half watt or better per candle power. The mercury arc has the advantage of perfect steadiness, a long life - requiring no a...... r efficiency of the latter ; and the inconvenience of daily attendance required by an open arc, and the large consumption of carbons, makes a return to this type improbable. For this reason the flame carbon lamp has not proven suitable for general outdoor illumination, as street lighting, where the cost of carbons and trimming would usually far more t...Lecture 11: Light Intensity And Illumination - 309 candidate hits
Source: Radiation, Light and Illumination (1909)
Location: lines 12574-16484 - Tracked concepts: Illumination, Light
Open source text - Open chapter workbench
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 de ...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 gene ...Lecture 10: Light Flux And Distribution - 276 candidate hits
Source: Radiation, Light and Illumination (1909)
Location: lines 9389-12573 - Tracked concepts: Illumination, Light, Light flux density
Open source text - Open chapter workbench
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 li ...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...Lecture 3: Physiological Effects Of Radiation - 262 candidate hits
Source: Radiation, Light and Illumination (1909)
Location: lines 2366-3638 - Tracked concepts: Illumination, Light, Photometry
Open source text - Open chapter workbench
... CTURE III. PHYSIOLOGICAL EFFECTS OF RADIATION. Visibility. 20. The most important physiological effect is the visibility of the narrow range of radiation, of less than one octave, between wave length 76 X 10~6 and 39 X 1Q-6. The range of intensity of illumination, over which the eye can see with practically equal comfort, is enormous: the average inte...... e visibility of the narrow range of radiation, of less than one octave, between wave length 76 X 10~6 and 39 X 1Q-6. The range of intensity of illumination, over which the eye can see with practically equal comfort, is enormous: the average intensity of illumination at noon of a sunny day is nearly one million times greater than the illumination given...Lecture 13: Physiological Problems Of Illuminating Engineering - 232 candidate hits
Source: Radiation, Light and Illumination (1909)
Location: lines 17446-17956 - Tracked concepts: Illumination, Light, Light flux density
Open source text - Open chapter workbench
LECTURE XIII. PHYSIOLOGICAL PROBLEMS OF ILLUMINATING ENGINEERING. 123. The design of an illumination requires the solution of physiological as well as physical problems. Physical considera- tions, for instance, are the distribution of light-flux intensity throughout the illuminated space, as related to si ...LECTURE XIII. PHYSIOLOGICAL PROBLEMS OF ILLUMINATING ENGINEERING. 123. The design of an illumination requires the solution of physiological as well as physical problems. Physical considera- tions, for instance, are the distribution of light-flux intensity throughout the illuminated space, as related to size, location and number of light sources, while th ...Reading Layers To Build Out
Section titled “Reading Layers To Build Out”| Layer | What to add next |
|---|---|
| Steinmetz wording | Pull exact source passages only after scan verification; keep OCR text labeled until then. |
| Modern engineering reading | Translate the source usage into present electrical-engineering or physics language without erasing the older vocabulary. |
| Mathematical layer | Link equations, variables, diagrams, and worked examples when the concept has formula candidates. |
| Historical layer | Identify whether the term is still used, renamed, absorbed into modern theory, or historically obsolete. |
| Ether-field interpretation | Keep interpretive readings separate from Steinmetz’s explicit claim and from modern physics. |
| Open questions | Record places where the concordance suggests a lead but the scan or edition has not yet been checked. |
Next Editorial Actions
Section titled “Next Editorial Actions”- Open the highest-priority source-text passages above and verify the wording against scans.
- Promote exact definitions, equations, diagrams, and hidden-gem passages into this page with source references.
- Add related concept links, equation pages, and diagram pages once the evidence is scan checked.
- Keep speculative or Wheeler-style readings in explicitly labeled interpretation blocks.