1. Das Brechungsgesetz in der Fassung von Snellius

   • Klaus Hentschel

   Pages: 297 - 344

2. On Lemmas 1 and 2 to Proposition 39 of Book 3 of Newtons Principia

   • Geoffrey J. Dobson

   Pages: 345 - 363

3. A Potential Disagreement Between Helmholtz and Hertz

   • Jed Z. Buchwald

   Pages: 365 - 393