@misc{indiciaec97398cfd9c5,
  title = {The elements of electrical engineering; a text book for technical schools and colleges. Vol. II. Alternating currents — Illustration, Page 381},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/17500725},
  note = {Source identifier: page-17500725}
}