Moiré Fringes Produced by a Point Projection X-ray Microscope.

Moiré fringes produced by soft X-rays passing through crossed gratings of fine wire mesh are demonstrated. Regular systems of bands appearing superimposed on radio-micrographs of oriented cellulosic structures may also be moiré fringes. These fringes could be formed by fibrillate structures acting as crossed diffraction gratings.