Above was another somewhat similar box with another roll of paper.
Constance attached the instrument to the telephone, an enigmatical conversation followed, and she hung up the receiver.
A few minutes later, she took the stylus that was in the lower box.
Hastily across the blank paper she wrote the words, "We are ready." Mackenzie was too fascinated to ask questions.

Suddenly, out of the corner of his eye, he saw something in the upper box move, as if of itself.

It was a similar, self-inking stylus.
"Watch!" exclaimed Constance.
"Do you get this ?" wrote the spirit hand.
"Perfectly," she scrawled in turn.

"Go ahead, as you promised." The upper stylus was now moving freely at the ends of its two rigid arms, counterparts of those holding the lower stylus.
"We promise," it wrote, "that in consideration of the return..." "What is it ?" interrupted Graeme, as the meaning of the words even now began to dawn on him.
"A telautograph," she replied simply, "a long distance writer which I have had installed over a leased wire from the hotel room of Wickham to meet the demands of you two.

With it you write over wires just as with the telephone you talk over wires.