Spark cell assembly

Claim 1

A SPARK CELL ADAPTED TO BE EMPLOYED WITH SPECTROGRAPHIC APPARATUS FOR RECEIVING AND MEASURING THE INTENSITY OF THE RADIATION FROM THE SPARK CELL, WHICH COMPRISES A MAIN TUBE WHICH IS AN ELONGATED HEAVY-WALLED GLASS TUBE HAVING ITS LONGITUDINAL AXIS EXTENDING VERTICALLY, A RADIATION EXIT TUBE PROJECTING HORIZONTALLY FROM ONE SIDE OF THE MAIN TUBE INTERMEDIATE THE ENDS THEREOF, A REMOVABLE QUARTZ WINDOW CLOSING THE OUTER END OF THE RADIATION EXIT TUBE, A GAS INLET TUBE EXTENDING FROM ONE SIDE OF THE MAIN TUBE INTERMEDIATE AN END THEREOF AND THE RADIATION EXIT TUBE, A GAS OUTLET TUBE EXTENDING FROM THE OPPOSITE SIDE OF THE MAIN TUBE INTERMEDIATE THE OTHER END THEREOF AND THE RADIATION EXIT TUBE, OPPOSING ALIGNED ELECTRODES EXTENDING INTO THE MAIN TUBE THROUGH THE ENDS THEREOF AND HAVING THEIR INNER ENDS SPACED A SMALL DISTANCE APART AT THE AXIS OF THE RADIATION EXIT TUBE SO AS TO PROVIDE A SPARK GAP ON SUCH AXIS, RESILIENT MEANS IN EACH END OF THE MAIN TUBE SURROUNDING SAID FRICTIONALLY ENGAGING THE ELECTRODES AND HOLDING THEM IN THEIR LONGITUDINALLY ADJUSTED POSITIONS.