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Its radioscope tracks a bugged automobile 240 km. away.

The room was a small one, just large enough, indeed, to operate the radioscope, which was exactly the same as the one in the room I had just quitted.

An ordinary telescope was attached to the huge tube of the radioscope, and with Almos' dexterity I soon located Earth through it, thus sighting the radioscope for that planet.

Thus we may have a free current of super-radium flowing from the radioscope to Earth and returning into the virator, and by substituting the projecting apparatus, we have a current flowing from the virator to Earth and returning into the receiving apparatus.

You will not observe any image, owing to my having removed the lenses of the radioscope, but your instrument will glow in response to the current.