1. An apparatus used for miniature writing or drawing.
2. The art or technique of writing with extremely small characters.
3. In psychiatry, abnormally small handwriting, as a symptom of a nervous disorder.
4. An instrument that magnifies the microscopic movements of a diaphragm by means of light interference and records them on a moving photographic film; may be used for recording various pulse curves, sound waves, and any forms of motion that may be communicated through the air to a diaphragm.

The photographic recording of images produced by the electrons from an electron microscope.

The electron beam carries the images through an array of lenses and an enlarged electron image is used to stimulate a fluorescent screen that is photographed by a camera system.