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A wireless telegraphic signal, transmitted across a distance equal to the diameter of the earth, would be reduced to a mere sixteen-millionth part if it had to travel over the distance to Mars; in other words, if wireless telegraphy attained the utmost excellence now hoped for it that is, of being able to girdle the earth it would have to be increased a thousandfold and then a thousandfold again, and finally multiplied by 16, before an appreciable signal could be transmitted to Mars.
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