“In a tank at the bow,” Nelson answered. “Here’s the supply pipe here.”
“And what’s that thing?”
“Vaporizer. The gasoline enters here and the air here—see?”
“Then what happens?”
“Why, they mix into vapor, which passes up through this pipe to the cylinders.”
“Oh!” said Bob. “Well, it sounds all right, but I don’t see how that makes the boat go. If I were you I’d stick a mast on her and have some sort of a sail.”
“Oh, if the engine gives out,” laughed Nelson, “we’ll put Tommy overboard and let him tow us!”
“I mean to learn all about this thing,” said Bob resolutely with a final look at the engine. “How fast did you say she can go, Nel?”
“She’s supposed to make eleven and a half miles an hour, but she’s done better than that.”
“That doesn’t sound very fast,” said Tom.