(See front cover)
Some years ago a scientist walked out into a Baltimore park to take a picture. His fertile brain and nimble hands had produced a "fisheye lens," a hollow hemisphere of glass filled with liquid, which would focus a sweep of 180° on one plate. He decided to place himself beneath a bridge, photograph the underside of the bridge's arch from horizon to horizon. By the time he had finished setting up his mysterious-looking device, he had attracted a large crowd of gawpers. He snapped his picture, looked up with an...
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