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The expert receives so much faster than he sends that abbreviated codes are used, and he may take eighty to eighty-five words a minute on a typewriter in correct form. The motor curve seems to asymptotically approach a perhaps physiological limit, which the receiving curve does not suggest. This seems a special case of a general though not yet explained law.
The intensity is not proportional to the electromotive force, and it increases at first as the electromotive force augments; but it approaches asymptotically to a maximum value which corresponds to the number of ions liberated, and can therefore serve as a measure of the power of the excitement. It is this current which is termed the current of saturation.
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