@misc{indiciae65489ae29c01,
  title = {The elements of electrical engineering; a text book for technical schools and colleges. Vol. I. Direct current machines; electric distribution and lighting — Illustration, Page 439},
  year = {1907},
  url = {https://www.biodiversitylibrary.org/page/17500247},
  note = {Source identifier: page-17500247}
}