Transcriber’s Note
The source for this e-book was a hand-written thesis.
Footnotes have been moved to the end of the book.
The captions for Figures 23, 25, 26, 27, 28, 29 and 30 are reproduced, however, the original drawings were not bound with the published thesis and are therefore not part of this e-book.
The author’s spelling has been maintained, Some standardization of punctuation was done to improve readability.
The following proper names as used by the author are reproduced here with their more commonly used spelling:
| Author | Standard |
| Thompson | Thomson |
| Wimhurst | Wimshurst |
| Dr Urbitzkany’s | Alfred von Urbanitzsky |
| Lentz | Lenz |
| Pacinnotti | Pacinotti |
| Foucalt’s | Foucault’s |
Phrases and titles which the author portrayed by underlying have been presented in italics. Some standardization of these was also done particularly with regard to the presentation of illustration captions.