Hawkins Electrical Guide
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The Hawkins Electrical Guide was a technical engineering book written by Nehemiah Hawkins, first published in 1914, intended to explain the highly complex principles of the new technology of electricity in a way that could be understood by the common man. The book is notable for the extremely high number of detailed illustrations it contains, and the small softbound size of the volumes.
The book was published by Theodore Audel & Company, with Theodore Audel being a pseudonym for Hawkins, who was publishing his own work. The majority of the illustrative content became the basis of decades of follow-up books published under the Audels brand name. The illustrative content of these books can still be found in Audels books sold new today.
Because the Hawkins Electrical Guide was printed in the United States prior to 1923, the content of the books has passed into the public domain.
Free media access on the Internet
[edit | edit source]Due to several book digitizing initiatives such as Project Gutenberg, and the Internet Archive,[1] many of these older public domain books are becoming available on the Internet. This series of books is currently available for free, non-commercial use from Google Books and each volume can be downloaded as a PDF, though the illustration scan quality is not as good as the ones being added to Wikipedia on this page by Wikipedia contributors.
Google Books Volume Links
[edit | edit source]As of September 2008, Google Books does not provide a simple, direct means to find each volume of this media set, and appears to include scanned copies of different volumes from different libraries and copyright dates from 1914-1917. Scan quality varies from one volume to the next. For your convenience, links to the available scanned media are provided here:
- Volume 1, Copyright 1917, Impression 1921, from the University of California[2]
- Volume 2, Copyright 1917, from the University of Wisconsin - Madison, General Library System[3]
- Volume 3, Copyright 1917, Impression 1926, from the Harvard College Library[4]
- Volume 4, Copyright 1917, from the University of Wisconsin - Madison, General Library System,[5]
- Volume 5, Copyright 1917, from the University of Wisconsin - Madison, General Library System[6]
- Volume 6, Copyright 1917, from the Harvard College Library[7]
- Volume 7 & 8, Copyright 1914, from the New York Public Library[8]
- Volume 9, Copyright 1917, Impression 1926, from the Harvard College Library[9]
- Volume 10, Copyright 1917, Impression 1924-1925, from the Harvard College Library[10]
Illustrations from Volume 1
[edit | edit source]Chapter 14: The Dynamo: Current Commutation
[edit | edit source]| File:Gramme Ring - 1 coil - 1 pole.svg | File:Gramme Ring - 2 coil - 1 pole.svg |
| Page 174, Figure 182 Description: Separate excitation of an electric generator. DC generator with commutation is shown, but the principle also applies to AC alternators. |
Page 175, Figure 183 Description: A one pole, two coil Gramme ring. The second coil is wired in series with the first and the voltage of both is added together. |
| File:Gramme Ring - 4 coil.svg | File:Gramme Ring - 6 coil - 3 pole.svg |
| Page 177, Figure 185 Description: A four coil Gramme ring. The coils of A and A' sum together as do the coils of B and B', producing two pulses of power 90 degrees out of phase with each other. When coils A and A' are at maximum output, coils B and B' are at zero output. |
Page 178, Figure 186 Description: A three pole, six coil Gramme ring, and a graph of the combined three poles, each 120 degrees out of phase from the other and summing together. |
Chapter 15: Classes of Dynamo
[edit | edit source]| File:Self Excited vs Magneto.png | File:Separately Excited.png |
| Page 183 Description: A self-excited shunt-wound DC generator is shown on the left, and a magneto DC generator with permanent field magnets is shown on the right. The shunt-wound generator output varies with the current draw, while the magneto output is steady regardless of load variations. |
Page 196 Description: A separately excited DC generator with bipolar field magnets. Separately excited generators like this are commonly used for large-scale power transmission plants. The smaller generator can be either a magneto with permanent field magnets or another self-excited generator. |
Chapter 16: Field Magnets
[edit | edit source]| File:Salient pole bipolar series field generator.jpg | File:Consequent pole bipolar series field DC generator.jpg |
| Page 200, Figure 201 Description: Salient pole, bipolar field, series-wound DC generator. |
Page 201, Figure 203 Description: Consequent pole, bipolar field, series-wound DC generator. |
| File:Modern Consequent-Pole Four-Field Shunt-Wound DC Generator.jpg | |
| Page 202, Figure 206 Description: Consequent pole, four-field, shunt-wound DC generator |
Chapter 17: The Armature
[edit | edit source]| File:Gramme Ring Armature - Early Form.jpg | File:Gramme Ring - Modern Form.png |
| Page 223 Description: Early form of the Gramme ring armature with coils penetrating the interior of the ring. |
Page 224 Description: Modern design of the Gramme ring, wrapped only around the exterior of the core. |
| File:Gramme Ring Armature - Minimal Core Penetration.jpg | File:Drum Wound Armature - Single Coil Example.jpg |
| Page 225 Description: Diagram of magnetic lines through a Gramme ring, showing the very few magnetic lines of force crossing the center gap. |
Page 226 Description: Example of a single winding around the exterior of a drum core with no wires penetrating the interior. |
Chapter 19: Theory of the Armature
[edit | edit source]| File:Dynamo - exaggerated rotating field distortion.png | File:Dynamo - iron filings show distorted field.png |
| Page 264 Description: Exaggerated example of how the field is distorted by the rotor. |
Page 265 Description: Iron filings show the distorted field across the rotor. |
| File:Gramme Ring - Four Pole Stator Field Flow.jpg | |
| Page 281 Description: Field lines of a four-pole stator passing through a Gramme ring or drum rotor. |
Chapter 20: Commutation and the Commutator
[edit | edit source]| File:Dynamo - commutating plane definitions.jpg | File:Dynamo - commutating plane idealized.svg |
| Page 284 Description: In a dynamo, the contact point of where a pair of brushes touch the commutator is referred to as the commutating plane. In this diagram the commutating plane is shown for just one of the brushes. |
Page 285 Description: Centered position of the commutating plane if there were no field distortion effects. |
| File:Dynamo - commutating plane field distortion.svg | File:High-Current Copper-Brush Commutated Dynamo.jpg |
| Page 286 Description: Actual position of the commutating plane to compensate for field distortion. |
Page 301, Figure 328 Description: Dynamos are no longer used for power generation due to the size and complexity of the commutator needed for high power applications. This large belt-driven high-current dynamo produced 310 amperes at 7 volts, or 2,170 watts, when spinning at 1400 RPM. |
Illustrations from Volume 2
[edit | edit source]Chapter 35: Operation of Motors
[edit | edit source]| File:DC motor starting rheostat.PNG | |
| Page 669 Description: 1917 DC motor manual starting rheostat, with no-voltage and overload release features. |
Illustrations from Volume 4
[edit | edit source]Chapter 46: Alternating Currents
[edit | edit source]| File:Elementary Two Phase Alternator.jpg |
| Page 669, Figure 1253 Description: A simplified diagram of a two-phase alternator |
| File:Hawkins Electrical Guide - 3phase Elementary 6wire.jpg |
| Page 1026, Figure 1260 Elementary six-wire three-phase alternator, with each phase using a separate pair of transmission wires. |
| File:Hawkins Electrical Guide - 3phase Elementary 3wire.jpg |
| Page 1026, Figure 1261 Description: Elementary three-wire three-phase alternator, showing how the phases can share only three transmission wires |
Illustrations from Volume 6
[edit | edit source]Chapter 68: Wave Form Measurement
[edit | edit source]| File:Hospitalier Ondograph Diagram.png | File:Hospitalier Ondograph.png |
| Page 1850, Figure 2957 Description: Diagram of Hospitalier Ondograph |
Page 1851, Figure 2958 Description: View of Hospitalier Ondograph |
| File:Oscillograph Duddell Moving Coil.png | File:Oscillograph Time-Index Generator.png |
| Page 1858, Figure 2607 Description: Duddell Moving Coil Oscilliograph |
Page 1865, Figure 2620 Description: Time-index marking generator for use with Duddell moving-coil oscillograph |
| File:Oscillograph Cinematograph Camera.png | File:Oscillograph recorded on film.png |
| Page 1866, Figure 2621, 2622, 2623 Description: Interior of cinematograph camera as used on Duddell moving coil oscillograph for obtaining long records. |
Page 1867, Figure 2625 Description: Oscilliograph recorded on moving film showing sparking as a high-voltage switch is opened |
Illustrations from Volume 7
[edit | edit source]Chapter 66, Power Stations
[edit | edit source]| File:Murray Alternator with Belt-Driven Exciter.jpg |
| Page 1979 Description: A 50,000 - 100,000 KVA direct-driven power station AC alternator with a separate belt-driven exciter generator. |
Notes
[edit | edit source]- The author's full name was Nehemiah Hawkins.[11]
- In 1882 a Mr. N. Hawkins "writing under the name Theodore Audel" founded a magazine called "Steam".[12] Another Hawkins pseudonym: William Rogers.[citation needed][relevant?]
- Also available online at Internet Archive[13]
- Hawkins bibliography at Open Library[14]
- Historical advertisement for the Hawkins Electrical Guide, Popular Science monthly, February 1919, Page 6[15]
References
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