bearings and contact surfaces have fused and crystalized. I never saw such poor platinum as I've been getting lately, and I pay the highest prices for it, too. The trouble is that the supply of platinum is giving out, and they'll have to find a substitute I guess."
"Can't we go home in her?" asked Ned.
"I'm afraid not. I've got to put in new platinum bearings and contacts before she'll spark. I only wish I could get hold of some of the better kind of metal."
The magneto of an aeroplane performs a service similar to one in an automobile. It provides the spark that explodes the charge of gas in the cylinders, and platinum is a metal, more valuable now than gold, much used in the delicate parts of the magneto.
"Well, I guess it's walk for ours," said Ned ruefully.
"I'm afraid so," went on Tom. "If I only had some platinum, I could"
"Perhaps I could be of service to you," suddenly spoke a voice behind them, and turning, the youths saw a tall, bearded man, who had evidently come from the lonely house. "Did I hear you say you needed some platinum?" he asked. He spoke with a foreign accent, and Tom at once put him down for a Russian.
