electric dynamo.

"Is the test arranged, Rosa?" the little man queried eagerly in Italian.

"The date is not fixed yet," she replied in the same language. "It will
be, I hope, within the next two weeks. And then--"

"Fame and fortune for both of us," he interrupted with quick enthusiasm.
"Ah, Rosa, I have worked and waited so long for this, and now it will
come, and with it the dominion of the world again by our country. How
will I know when the date is fixed? It would not be well to write me
here."

My lady of mystery stroked the slender, nervous hand caressingly, and a
great affection shone in the blue-gray eyes.

"At eight o'clock on the night of the test," she explained, still
speaking Italian, "a single light will appear at the apex of the capitol
dome in Washington. That is the signal agreed upon; it can be seen by
all in the city, and is visible here from the window of your bedroom."

"Yes, yes," he exclaimed. The feverish glitter in his eyes deepened.

"If there is a fog, of course you will not attempt the test," she went
on.

"No, not in a fog," he put in quickly. "It must be clear."

"And if it is clear you can see the light in the dome without
difficulty."