Have you set a price on it? It is worth much more than the ordinary kind."
"The price is nothing to you," replied the Russian, with a smile. "I am only too glad to help you fix your aeroplane. Will it take long? I should like to watch you."
"Come along," invited Tom. "I can soon have it going again, and I'll give you a ride, if you like."
"No, thank you, I'm hardly up to that yet, though I may be some day. The machine I made never flew well and I had several bad falls."
Tom and Ned worked rapidly on the magneto, and soon had replaced the defective bits of platinum.
"If the Russians had such a machine as this maybe they could have gotten to that mine, " suggested Ned, who was very proud of Tom's craft.
"It would be useless in the terrific winds, I fear," answered Ivan Petrofsky. "But now I care little for the mine. It is my brother whom I want to save. He must be in some of the Siberian mines, and if I had such a craft as this I might be able to rescue him."
Tom Swift dropped the file he was using. A bright light sparkled in his eyes. He seemed strangely excited.
"Mr. Petrofsky!" he cried, "would you let me
