and are generally positioned so that a line from the anode to the cathode and a line between the other two electrodes intersect at a focal point generally on the axis of the chamber. The radial distance of each electrode from the focal point is fixed for a reason discussed below. The general construction of electrodes 63 and 65 is shown in Fig.6 to Fig.9. These electrodes include a conductive rod 71 (see Fig.7) preferably of brass or copper; a conductive, generally rectangular plate 73 (see Fig.6, Fig.8 and Fig.9); and tungsten point 75 mounted in a conductive base 77 generally at right angles to the plate (see Fig.8 and Fig.9).
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