The Three-dimensional or Solid-Image Microscope

Abstract

IN a recent communication¹ Gregory and Donaldson describe a prototype microscope which produces a three-dimensional image. In this instrument the microscope and the viewing screen oscillate relative to the object so that the microscope scans the object in depth and the viewing screen follows in phase the real image produced. The frequency of the motion is such that an apparent image of each successive plane is maintained in space without appreciable flicker because of the retention of the image by the eye. Reasonable success was claimed at low magnifications, × 20 being about the greatest useful magnification.