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Carl felt Forrest Haviland's hand on one shoulder, then an awkward pat from tough Jack Ryan's paw, as Tony Bean's violin turned the plaintive half-light into music, and broke its heart in the "Moonlight Sonata." "Yuh, piston-ring burnt off and put the exhaust-valve on the blink. That means one cylinder out of business," growled Hawk Ericson.
One of these magnets closes an exhaust-valve, and the other opens an inlet-valve, in the compressed air tank. At once air is forced into this double cylinder, which you see at the bottom of the stabilizer, filling the half which is to operate its own set of rudders; and a piston begins to work inside.
A slight pounding which had developed was finally located in the pinion of a small gear-wheel that operated the exhaust-valve. It is sometimes by no means easy to locate a pounding in a gasoline motor, and yet it must be found and stopped. An expert from the factory once worked four days trying to locate a very loud and annoying pounding.
Then I broke down altogether and began to cry like a baby, while Gerard got out and emptied the kerosene from the oil lamps into the exhaust valves. You see, pieces of scale from the inside of the cylinders had wedged against the exhaust-valve seats so that they wouldn't close tight, but leaked and leaked.
Near the end of this stroke the exhaust-valve is opened, the products of combustion partly escape, and are partly driven out by the second inward stroke. I say partly, for a considerable clearance space, equal to 38 per cent. of the whole cylinder volume, remains unexhausted at the inner end of the cylinder.
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