Bertrand's Idiocyclophanous Spar-prism

  title={Bertrand's Idiocyclophanous Spar-prism},
  author={Harsha Madan},
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