Abstract: A electrocardiographic electrode assembly is attached on a spot of the body that is roughly inside an electrocardiowave-appearing region, and an optimum signal discriminating circuit of an electrocardiograph discriminates an electrode that is most suitable for an electrocardiographic measurement out of the plural electrodes of the electrocardiographic electrode assembly. The electrocardiograph receives electric signals (electrocardiowaves) captured by the discriminated electrode, and stores the electric signals in a memory. The electric signals stored in the memory, after a measurement of the electrocardiovaves finishes, is given as an electrocardiographic pattern to a doctor for diagnosis. In this manner, in the electrocardiographic measurement, the electrocardiographic electrode assembly is only needed to be attached on a spot of the body that is roughly inside the electrocardiovave-appearing region. Therefore, even an amateur or nonexpert can easily perform an electrocardiographic measurement.

Abstract: An electrochromic display cell has a first transparent plate for viewing said display therethrough and a second plate having thereon a reflective metal coating, said coating being inert to electrochemical oxidation under the conditions of operation of said display. Conductive leads are covered, at least in part, by an insulating film.

Abstract: An improved display driving circuit for driving an electro-chromic display cell is provided. The electro-chromic display cell is formed of a first conductor adapted to be referenced to a first potential and a second conductor spaced apart from the first conductor and adapted to be referenced to either a second potential or a third potential. An oxidation-reduction sensitive compound is disposed between the first and second spaced apart conductors. The compound is normally at a first level of transparency in response to a first predetermined potential difference between the first potential and the second potential and is altered to a second level of transparency in response to a second predetermined potential difference between the third potential and the first potential.

Abstract: A display device includes a layer of photoconductive material and a layer of electrochromic material between electrodes. The device is useful as an image converter for the spectrum from X-rays to infra-red and as a memory device.

Abstract: In an electro-chromic display device having a display field, provision is made for showing a plurality of indicia in the same or overlapping regions, thereby increasing the range of indicia which can be displayed in a given area.

Abstract: A battery charging circuit for effecting efficient charging of a battery by a solar energy source is provided. A voltage detecting circuit is coupled in parallel with a battery for detecting each state of charge of same, the detecting circuit including a constant voltage element. Transistor by-pass circuitry includes first and second current path electrodes connected in parallel with the battery. The transistor by-pass circuitry further includes a third control electrode coupled to the detecting circuit, and in response to the state of charging of the battery detected thereby, respectively effects one of an increase and decrease in the current carried by said current path electrodes.