@misc{indiciae015aaa8f8537,
  title = {Pike's illustrated descriptive catalogue of optical, mathematical and philosophical instruments, manufactured, imported, and sold by the author; with the prices affixed at which they are offered in 1848 ... — Illustration, Page 272},
  year = {1848},
  url = {https://www.biodiversitylibrary.org/page/20226320},
  note = {Source identifier: page-20226320}
}