Margaret Penrose - The Campfire Girls of Roselawn - or, a Strange Message from the Air

But the others paid no attention at the moment to what Jessie was saying. It was plain that Amy did not at all comprehend what her chum considered. The lively one had forgotten altogether about the unknown girl she and Jessie had seen borne away in the big French car.

That afternoon Mr. Norwood brought home the radio receiving set in the automobile. The two girls, with a very little help, but a plethora of suggestion from Darry and Burd, proceeded to establish the set on a table in Jessie’s room, and attach the lead-in wire and the ground wire.

Jessie had bought a galena crystal mounted, as that was more satisfactory, the book said. After all the parts of the radio set had been assembled and the connections made, the first essential operation, if they were to make use of the invention at once, was to adjust the tiny piece of wire – the “cat’s whisker” – which lightly rests on the crystal-detector, to a sensitive point.

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