Lantern Slides A. K. Christensen.
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In the early days of biological electron microscopy (in the 1950s and 1960s) it was standard practice to prepare electron micrographs for projection in lectures as 3-1/4 x 4" lantern slides. It was felt that 2 x 2" projection slides were too small to transmit the detail and quality that was necessary for electron micrographs. As a consequence, giving a lecture required two different projectors, one for lantern slides and the other for Kodachromes or other 2 x 2" slides. By about 1970 it had become apparent that the slight resolution benefit of lantern slides was not worth the pain of having to deal with two projectors during a lecture. So everyone switched to using only 2 x 2" slides. I threw away almost all of my lantern slides, but kept a slide box containing some of my favorites. Of course, in the 1990s the 2 x 2" projection slides were all replaced by digital images in PowerPoint. The present PowerPoint shows digitized images of the old lantern slides that I kept.