
IN THIS magazine last June Professor Russell described the Schmidt telescope- or camera, to speak more exactly, since it cannot be used to advantage as a visual instrument-and this present month with his article (pages 248-249) we have reproduced photographs, one celestial, the other terrestrial, taken with a Schmidt made by the Lowers of San Diego. The little picture on the present page is another, and the camera itself, its box uncovered, is shown at right.
For photographic work the Schmidt telescopic camera, with its oddly curved correcting lens in front, is as far ahead of a telescope camera having an ordinary paraboloidal mirror without a correcting lens, as a paraboloidal mirror is ahead of a spherical mirror for usual work-farther, in fact. Oddly enough, the Schmidt reverts to a spherical primary but it is its correcting lens that does all the business of knocking out the coma that otherwise puts tails on star images at the edge of the plate and, in fact, on all except the central eighth of a degree or so of plates taken with paraboloidal mirrors such as the 100-inch. But a Schmidt gives a good field 12 degrees or more diameter-no tails.
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