Rotational planar chart recorder and chart therefor

Abstract From the Canadian patent

Abstract of the Disclosure, A chart recorder is described for recording parameters such as temperature and humidity on rotating planar charts. Pens, which are used to form traces on a chart as this is rotated, are moved by pen actuators along travel paths that are parallel to a straight radius relative to the axis of chart rotation. The pen actuators are electrically moved under the control of a microprocessor to positions as determined by representative of parameter values. Various mechanical and electrical control features are described whereby pen motions are caused intermittently so as to preserve battery power and achieve long term portable-operation.