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Several conceivable methods for the formation of optical images by x-rays are considered, and a method employing concave mirrors is adopted as the most promising. A concave spherical mirror receiving… (More)
A new type of Fresnel zone plate has been constructed which can focus ultraviolet radiation of any wavelength down to the soft x-ray region. It consists of a set of thin circular gold bands made self… (More)
The factors which affect resolution in diffraction microscopy are studied. The inequality pλ>4nd/N is a necessary condition for making good holograms, where p is the distance between source and film,… (More)
The recent pinhole radiograph of the sun made by Friedman  clearly points up the need for image-forming devices to focus on solar and other X-ray sources in space. In the wavelength region from… (More)
Charged, inflated, lighter-than-air rubber balloons moored by strings form a useful electroscope which can be viewed by a large audience. The balloons are out of the demonstrator's way and are not… (More)