Ferdinand Bauer or Johann and Joseph Knapp? A rectification

Johann Joseph Oppel (1855) on Geometrical–Optical Illusions: A Translation and Commentary

The term geometrical–optical illusions was coined by Johann Joseph Oppel (1815–1894) in 1855 in order to distinguish spatial distortions of size and orientation from the broader illusions of the senses. We present a translation of Oppel’s article and a commentary on the material described in it. Oppel did much more than give a name to a class of visual spatial distortions. He examined a variety...

Reply to Bauer and Goff.

TO THE EDITOR—We read with interest the letter by Bauer and colleagues commenting on the need for cost-justification of new diagnostic tests in the field of infectious diseases [1], such as the recently US Food and Drug Administration–approved T2Candida panel for diagnosis of candidemia [2]. Indeed, the new alternatives for disease diagnosis [3] contribute to the exponential rise of healthcare ...

Georg Bauer

32-37 Knapp Feature

ITE JOURNAL / NOVEMBER 1999 HIGHWAY-RAILROAD GRADE crossings are a relatively unique and sometimes perilous intersection of two transportation modes. The cost of collisions at these intersections is high in both dollars and human lives. The amount and type of sight distance provided at highway-railroad grade crossings can have significant impacts on safety. The proper calculation of these sight...

Johann Wolfgang