This is a graph. The horizontal axis is marked off from 0 to 50 and is labeled Collecting Plate Voltage (volts). The vertical axis is marked off from 0 to 120 and is labeled Collecting Plate current (microamps). The top curve starts at 2 volts and 66 microamps. It slopes up to the right with a large slope at first and almost leveling off, ending at 50 volts and 116 microamps. This curve is labeled E c = 0 volts. 4 more curves are below this first one, they are labeled E c = minus 5 volts, E c = minus 10 volts, E c = minus 15 volts, and E c = minus 20 volts. The minus 5 volt curve starts at 2 volts and 50 microamps and ends at 50 volts and 94 microamps. The minus 10 v curve starts at 2 v and 44 uA ending at 50 v and 81 uA. The minus 15 v curve starts at 2 v and 40 uA ending at 50 v and 73 uA. The minus 20 v curve starts at 2 v and 37 uA ending at 50 v and 67 uA. End verbal description.
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