A chamber for a gas discharge laser is disclosed and may include a chamber housing having a wall, the wall having an inside surface surrounding a chamber volume and an outside surface, the wall also being formed with an orifice. The first logic block consists of a network of p-type transistors for implementing a predetermined logic function. CPU 8 sets a display position in one of the frames of image and displays a guide-indicator at the display position, wherein the guide-indicator is used for analyzing a specific motion of a person. The impedance of the signal coil in parallel with the impedance already loading the signal coil, transform the current signal back to a voltage equal and opposite to the noise voltage; thereby, canceling each other and eliminates the noise. The electromechanical tactile cell is adaptable for use with a Braille display.