Monochromatic Camera for Photography in the Far Ultraviolet

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Abstract
An ultraviolet monochromatic camera has been constructed which avoids the use of quartz or lithium fluoride optics. The camera makes use of two gratings mounted in the Wadsworth-type arrangement in such a way that the dispersions neutralize. The instrument is, thus, a double monochromator, a feature helpful in reducing stray light. Three forms of the camera have been developed, differing only in the manner in which the focus of the final image is achieved.The image is not purely monochromatic but contains a narrow range of wavelengths determined mostly by grating constants and slit widths. A description of the chromatic composition of the image is given and possible applications, including the study of solar limb darkening in Lyman-alpha radiation, are discussed.

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