Bertrand's Idiocyclophanous Spar-prism

@article{MadanBertrandsIS,
  title={Bertrand's Idiocyclophanous Spar-prism},
  author={Harsha Madan},
  journal={Nature},
  volume={42},
  pages={52-53}
}
IT is a good thing that Prof. Silvanus Thompson has brought the above prism to the notice of the Physical Society (see NATURE, vol. xli. p. 574); it is certainly remarkable that M. E. Bertrand himself has never thought fit to publish any description of his interesting invention. Perhaps it may be worth while to mention a fairly simple method of constructing… CONTINUE READING