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- UP and up climbed the powerful speed-plane, motors moaning an increasing song of effort. The first wisps of steam whipped grizzled pennants about the craft. Doc opened the cockpit windows and kept an accurate check on a thermometer.
- "This is nothing but cloud formation caused by very warm and moist air lifting out of the crater!" he called, raising his voice over the motor howl--for opening the windows nullified the soundproofing of the cabin.
- The vapor thickened. It poured densely into the cabin. The very world about them seemed to turn a bilious gray hue. Visibility was wiped out, except for a few score yards, beyond the wing tips.
- "Long Tom," Doc's energetic voice had little trouble piercing the engine clamor, "set the danger alarm for five hundred feet!"
- Long Tom hastily complied. This danger alarm was simply an apparatus which sent out a series of bell-like sounds very distinctive from the motor uproar, and another sensitive device which measured the time that ensued until an echo was tossed back by the earth. If this time interval became too short, an alarm bell rang.
- With it in operation, if the plane came blindly within five hundred feet of the crater bottom or sides, an alarm would sound. Doc had perfected this device. It was little different from the apparatus all modern liners use to take depth measurements.
- - The Land of Terror (1933) Chapter 15
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