Lecture 2: General Distribution
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 | General Lectures on Electrical Engineering |
| Year | 1908 |
| Section ID | general-lectures-electrical-engineering-lecture-02 |
| Location | lines 566-982 |
| Status | candidate |
| Word Count | 2681 |
| Equation Candidates In Section | 13 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”SECOND LECTURE GENERAL DISTRIBUTION DIRECT CURRENT DISTRIBUTION HE TYPICAL direct current distribution is the system of feeders and mains, as devised by Edison, and since used in all direct current distributions. It is shown diagrammatically in Fig. 2. The conductors are usually under- T f2a ^120 W^ -^\\ ft. 1 1 /30 i 1 \30 fZOT #1 /ze? /30 1 1 A ^_.. \ \ ItfO \ Fife. 2 24 GENERAL LECTURES ground, as direct current systems are used only in large cities. A system of three-wire conductors, called the "mains" is laid in the streets of the city, shown diagrammatically by the heavily drawn lines. Commonly, conductors of one million circular mil section (that is, a copper section which as solid round conductor would have a diameter of i") are used for the outsideSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Alternating current
Section titled “Alternating current”... and the "negative" con- ductor; and a conductor of half this size for the middle or "neutral" conductor. The latter is usually grounded, as pro- tection against fire risk, etc. Conductors of more than one million circular mils are not used, but when the load exceeds the capacity of such conductors, a second main is laid in the same street. A number of feeders, shown by dotted lines in Fig. 2, radiate from the generating station or converter substations, and tap into the mains at numerous points ; potential wires run back from the mains to the stati ...Impedance / reactance
Section titled “Impedance / reactance”... the size or section of the conductor, hence decreases rapidly with increasing current: a conductor of one million circular mils is one-tenth the resistance of a conductor of 100,000 circular mils, and so can carry ten times the direct current with the same voltage drop. The reactance of a conductor, however, and so the voltage consumed by self-induction, de- creases only very little with the increasing size of a conductor, as seen from the table of resistances and reactances of conductors. A wire No. 000 B & S G is eight times the section of a wire No. ...Dielectricity / capacity
Section titled “Dielectricity / capacity”... ve" and the "negative" con- ductor; and a conductor of half this size for the middle or "neutral" conductor. The latter is usually grounded, as pro- tection against fire risk, etc. Conductors of more than one million circular mils are not used, but when the load exceeds the capacity of such conductors, a second main is laid in the same street. A number of feeders, shown by dotted lines in Fig. 2, radiate from the generating station or converter substations, and tap into the mains at numerous points ; potential wires run back from the mains to the statio ...Radiation / light
Section titled “Radiation / light”... istribution, the station may have, in addition to the neutral bus bar zero, three positive GENERAL DISTRIBUTION 25 bus bars i, i', i", and three negative bus bars 2, 2', 2", differing respectively from the neutral bus by 120, 130 and 140 volts, as shown in Fig. 3. At light load, when the drop of voltage in the feeders is negligible, the feeders connect to the busses I, o, 2 of 120 volts. When the load increases, some of the feeders are shifted over, by transfer bus bars, to the 130 volt busbars i' and 2'; with still further increase of load, m ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Light | 4 | seeded |
| Ether | 3 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| ether | 3 | seeded |
| candle-power | 1 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
general-lectures-electrical-engineering-eq-candidate-0007 | For instance, in a 2 x 120 voltage distribution, the station | line 659 |
general-lectures-electrical-engineering-eq-candidate-0008 | instance, if by the potential wires a drop of voltage below 120 | line 687 |
general-lectures-electrical-engineering-eq-candidate-0009 | mils is one-tenth the resistance of a conductor of 100,000 | line 745 |
general-lectures-electrical-engineering-eq-candidate-0010 | of a wire No. 7, and therefore one-eighth (the resistance; | line 752 |
general-lectures-electrical-engineering-eq-candidate-0011 | but the wire No. 000 has a reactance of .109 ohms per 1000 | line 753 |
general-lectures-electrical-engineering-eq-candidate-0012 | feet, the wire No. 7 has a reactance of .133 oms, or only 1.22 | line 754 |
general-lectures-electrical-engineering-eq-candidate-0013 | times as large. Hence, while in the wire No. 7, the reactance, | line 755 |
general-lectures-electrical-engineering-eq-candidate-0014 | at 60 cycles, is only .266 times the resistance and therefore not | line 756 |
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”- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Ether references: Verify exact wording before drawing conclusions. Ether language must be separated from later interpretive systems.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Dielectricity / capacity: A Wheeler-style reading may emphasize dielectric compression, field stress, and stored potential, but this page treats that as interpretation unless Steinmetz explicitly says it.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- Ether references: If Steinmetz mentions ether, quote only the verified source words first; any broader ether-field synthesis belongs in a labeled interpretive layer.
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.