She turned a switch and the wire began to unroll from one spool and wind up on the other again.
A voice, or rather voices, seemed to come from the box itself.

It was uncanny.
"Hello, is this Mrs.LeMar ?" came from it.
"What is it ?" whispered Halsey, as if fearful of being overheard.
"A telegraphone," replied Constance, shutting it off for a moment.
"A telegraphone?
What is that ?" "A machine for registering telephone conversations, dictation, anything of the sort you wish.

It was invented by Valdemar Poulsen, the Danish Edison.

This is one of his new wire machines.

The record is made by a new process, localized charges of magnetism on this wire.