Chapter 4: Magnetism
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Electric Circuits |
| Year | 1917 |
| Section ID | theory-calculation-electric-circuits-chapter-04 |
| Location | lines 6942-9061 |
| Status | candidate |
| Word Count | 4132 |
| Equation Candidates In Section | 80 |
| Figure Candidates In Section | 4 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER IV MAGNETISM Hysteresis 36. Unlike the electric current, which requires power for its maintenance, the maintenance of a magnetic flux does not require energy expenditure (the energy consumed by the magnetizing current in the ohmic resistance of the magnetizing winding being an electrical and not a magnetic effect), but energy is required to produce a magnetic flux, is then stored as potential energy in the magnetic flux, and is returned at the decrease or disappear- ance of the magnetic flux. However, the amount of energy re- turned at the decrease of magnetic flux is less than the energy consumed at the same increase of magnetic flux, and energy is therefore dissipated by the magnetic change, by conversion into heat, by what may be called molecular magnetic friction, at least in those materials, which haveSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Magnetism
Section titled “Magnetism”CHAPTER IV MAGNETISM Hysteresis 36. Unlike the electric current, which requires power for its maintenance, the maintenance of a magnetic flux does not require energy expenditure (the energy consumed by the magnetizing current in the ohmic resistance of the magnetizing winding being an electr ...Hysteresis
Section titled “Hysteresis”CHAPTER IV MAGNETISM Hysteresis 36. Unlike the electric current, which requires power for its maintenance, the maintenance of a magnetic flux does not require energy expenditure (the energy consumed by the magnetizing current in the ohmic resistance of the magnetizing winding being an electrical and not ...Field language
Section titled “Field language”... of the cycle, Bi and B2, but not on the speed or wave shape of the change. If the energy which is consumed by molecular friction is sup- plied by an electric current as magnetizing force, it has the effect that the relations between the magnetizing current, i, or magnetic field intensity, H, and the magnetic flux density, B, is not revers- ible, but for rising, H, the density, B, is lower than for decreasing H; that is, the magnetism lags behind the magnetizing force, and the phenomenon thus is called hysteresis^ and gives rise to the hysteresis lo ...Waves / transmission lines
Section titled “Waves / transmission lines”... alternating or pul- sating current, a dissipation of energy by molecular friction occurs during each magnetic cycle. Experiment shows that the energy consumed per cycle and cm.^ of magnetic material depends only on the limits of the cycle, Bi and B2, but not on the speed or wave shape of the change. If the energy which is consumed by molecular friction is sup- plied by an electric current as magnetizing force, it has the effect that the relations between the magnetizing current, i, or magnetic field intensity, H, and the magnetic flux density, B, i ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 2 | seeded |
| Magnetic permeability | 2 | 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 |
|---|---|---|
theory-calculation-electric-circuits-eq-candidate-0147 | 37. As the industrially most important varying magnetic fields | line 7025 |
theory-calculation-electric-circuits-eq-candidate-0148 | f> = sB (2) | line 7043 |
theory-calculation-electric-circuits-eq-candidate-0149 | e = ns-^ (3) | line 7047 |
theory-calculation-electric-circuits-eq-candidate-0150 | F = ni (4) | line 7051 |
theory-calculation-electric-circuits-eq-candidate-0151 | H = 47r/ | line 7060 |
theory-calculation-electric-circuits-eq-candidate-0152 | hence, substituting (5) into (6) and transposing, | line 7061 |
theory-calculation-electric-circuits-eq-candidate-0153 | or, per cm.^ of the magnetic circuit, that is, f or s = 1 and Z =* ^h | line 7076 |
theory-calculation-electric-circuits-eq-candidate-0154 | ti?i,2 = — I HdB ergs (1«) | line 7092 |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-electric-circuits-fig-031 | (13) Fig. 31. the maximum possible hysteresis loss. | line 7195 |
theory-calculation-electric-circuits-fig-032 | )f Fig. 32. w | line 7206 |
theory-calculation-electric-circuits-fig-034 | s Fig. 34. half-scale, as curve 1, and the magnetization curve of magnetite , FeaO^ — which is about the same as the black scale of iron— ic*. | line 7575 |
theory-calculation-electric-circuits-fig-035 | 3 1 Fig. 35. ^ under the assumption that cither material rigidly follows the 1-8 power law up to the highest densities, by the equation, | line 7734 |
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.
- Hysteresis: Compare the passage with modern magnetic loss, B-H loop area, lag, material memory, and empirical loss laws.
- 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.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Hysteresis: An interpretive reading can treat hysteresis as field lag or memory, but the historical claim must remain Steinmetz’s actual magnetic-loss treatment.
- 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.
- 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.