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Jack ground down his brakes in chagrin. "Blocked!" he exclaimed disgustedly. "What awful luck," muttered Tom. "Isn't there any way we can get by?" inquired the doctor anxiously. "It's important that I should reach Mr. Chadwick as soon as possible." Jack made no reply, but bent over the gas-valve. In an instant the gas was hissing into the balloon bag.
If these ballonets empty owing to the pressure of the gas within the envelope, a rope system disposed within the balloon and connecting the ballonets and the gas-valve at the top is stretched taut, thereby opening the gas-valve. In this manner the gas-pressure becomes reduced until the ballonets are enabled to exercise their intended function. This is a safety precaution of inestimable value.
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