Abstract: A graphic recorder for facilitating the preparation of records of functions of time, comprising a base on which a scale is mounted for movement along one coordinate axis relative to a markable scale on which a series of increments in a function of time to be recorded can be inscribed, a cursor is mounted on the scale for movement along a second coordinate axis relative to a preinscribed scale on which increments of time have been recorded, and a chart affixed to the base that is recorded with the scales and provided with indicia locating appropriate regions for marking significant domains in a field defined by indicial sequences inscribed in the scales on the chart aligned with the coordinate axes.