Chapter 3: 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-03 |
| Location | lines 5445-6941 |
| Status | candidate |
| Word Count | 3495 |
| Equation Candidates In Section | 62 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER III MAGNETISM Reluctivity 29. Considering magnetism as the phenomena of a "magnetic circuit," the foremost differences between the characteristics of the magnetic circuit and the electric circuit are: (a) The maintenance of an electric circuit requires the ex- penditure of energy, while the maintenance of a magnetic circuit does not require the expenditure of energy, though the starting of a magnetic circuit requires energy. A magnetic circuit, there- fore, can remain "remanent" or "permanent." (6) All materials are fairly good carriers of magnetic flux, and the range of magnetic permeabilities is, therefore, narrow, from 1 to a few thousands, while the range of electric conductivi- ties covers a range of 1 to 10^^. The magnetic circuit thus is analogous to an uninsulated electric circuit inunersed in a fairly good conductor, as salt water: theSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Magnetism
Section titled “Magnetism”CHAPTER III MAGNETISM Reluctivity 29. Considering magnetism as the phenomena of a "magnetic circuit," the foremost differences between the characteristics of the magnetic circuit and the electric circuit are: (a) The maintenance of an electric circuit requires the ex- penditure of energy, wh ...Field language
Section titled “Field language”... tivity at lower magnetizing forces, and thereby the initial rate of rise of the magnetization curve, which is characteristic of the "magnetic hardness" of the material, it is called the coefficient of magnetic hardness. 30. When investigating flux densities, B, at very high field intensities, H, it was found that B does not reach a finite satura- tion value, but increases indefinitely; that, however, Bo = B-H (6) reaches a finite saturation value S, which with iron usually is not far from 20 kilolines per cm.^, and that therefore Frohlich's and K ...Hysteresis
Section titled “Hysteresis”... starting from Ao, passes through the zero point H = Oj B = 0, and thereby runs into the curve, J5i. The rising magnetization curve, or standard magnetic charac- teristic determined by the step-by-step method, J5i, thus is noth- ing but the rising branch of an unsymmetrical hysteresis cycle, traversed between such limits +Bo and — Ao, that the rising branch of the hysteresis cycle passes through the zero point. 33. The characteristic shape of a hysteresis cycle is that it is a loop, pointed at either end and thereby having an inflexion point about the m ...Alternating current
Section titled “Alternating current”CHAPTER III MAGNETISM Reluctivity 29. Considering magnetism as the phenomena of a "magnetic circuit," the foremost differences between the characteristics of the magnetic circuit and the electric circuit are: (a) The maintenance of an electric circuit requires the ex- penditure of energy, while the maintenance of a magnetic circuit does not require the expenditure of energy, though the starting of a magnetic circuit r ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Light | 1 | seeded |
| Magnetic permeability | 1 | seeded |
Chapter-Local Glossary Hits
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| 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-0085 | ties covers a range of 1 to 10^^. The magnetic circuit thus is | line 5464 |
theory-calculation-electric-circuits-eq-candidate-0086 | M = a(S - B) (1) | line 5486 |
theory-calculation-electric-circuits-eq-candidate-0087 | . = 1 (2) | line 5499 |
theory-calculation-electric-circuits-eq-candidate-0088 | for B = Oy equation (1) gives | line 5509 |
theory-calculation-electric-circuits-eq-candidate-0089 | /jLo = aS = -; a = — (4) | line 5511 |
theory-calculation-electric-circuits-eq-candidate-0090 | p = a+aH (5) | line 5529 |
theory-calculation-electric-circuits-eq-candidate-0091 | Bo = B-H (6) | line 5540 |
theory-calculation-electric-circuits-eq-candidate-0092 | far from 20 kilolines per cm.^, and that therefore Frohlich’s and | line 5543 |
Figure Candidates
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| No chapter-local candidates yet | - | - |
Hidden-Gem Quote Candidates
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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.
- Hysteresis: Compare the passage with modern magnetic loss, B-H loop area, lag, material memory, and empirical loss laws.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- 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”- 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.
- Hysteresis: An interpretive reading can treat hysteresis as field lag or memory, but the historical claim must remain Steinmetz’s actual magnetic-loss treatment.
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.