Apparatus Section 3: Direct-current Commutating Machines: Generated E.m.fs.
Research workbench, not a finished commentary page.
This page is generated from processed source text and candidate catalogs. It exists to help researchers decide what to verify, promote, and deeply decode next.
Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theoretical Elements of Electrical Engineering |
| Year | 1915 |
| Section ID | theoretical-elements-electrical-engineering-section-46 |
| Location | lines 10778-10835 |
| Status | candidate |
| Word Count | 386 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”III. Generated E.M.FS. 42. The formula for the generation of e.m.f. in a direct- current machine, as discussed in the preceding, is e = where e = generated e.m.f., / = frequency = number of pairs of poles X hundreds of rev. per sec., n = number of turns in series between brushes, and <£ = magnetic flux passing through the armature per pole, in megalines. In ring-wound machines, <f> is one-half the flux per field pole, since the flux divides in the armature into two circuits, and each 178 ELEMENTS OF ELECTRICAL ENGINEERING armature turn incloses only half the flux per field pole. In ring- wound armatures, however, each armature turn has only one con- ductor lying on the armature surface, or face conductor, while in a drum-wound machine each turn has two faceSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Magnetism
Section titled “Magnetism”... f e.m.f. in a direct- current machine, as discussed in the preceding, is e = where e = generated e.m.f., / = frequency = number of pairs of poles X hundreds of rev. per sec., n = number of turns in series between brushes, and <£ = magnetic flux passing through the armature per pole, in megalines. In ring-wound machines, <f> is one-half the flux per field pole, since the flux divides in the armature into two circuits, and each 178 ELEMENTS OF ELECTRICAL ENGINEERING armat ...Field language
Section titled “Field language”... cy = number of pairs of poles X hundreds of rev. per sec., n = number of turns in series between brushes, and <£ = magnetic flux passing through the armature per pole, in megalines. In ring-wound machines, <f> is one-half the flux per field pole, since the flux divides in the armature into two circuits, and each 178 ELEMENTS OF ELECTRICAL ENGINEERING armature turn incloses only half the flux per field pole. In ring- wound armatures, however, each armature turn has only o ...Radiation / light
Section titled “Radiation / light”III. Generated E.M.FS. 42. The formula for the generation of e.m.f. in a direct- current machine, as discussed in the preceding, is e = where e = generated e.m.f., / = frequency = number of pairs of poles X hundreds of rev. per sec., n = number of turns in series between brushes, and <£ = magnetic flux passing through the armature per pole, in megalines. In ring-wound machines, <f> is one-half the flux per fi ...Waves / transmission lines
Section titled “Waves / transmission lines”... uit, the total ampere-turns excitation per field pole is found, which is required for generating the desired e.m.f. Since the formula for the generation of direct-current e.m.f is independent of the distribution of the magnetic flux, or its wave shape, the total magnetic flux, and thus the ampere-turns re- quired therefor, are independent also of the distribution of magnetic flux at the armature surface. The latter is of impor- tance, however, regarding armature reaction and commutatio ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 3 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| No chapter-local term hits yet | - | - |
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 |
|---|---|---|
| No chapter-local candidates yet | - | - |
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”- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- 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”- 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.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- 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.
- 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.