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Updated: May 26, 2025
Normal shock-waves push away and then spring back! An ice-crack, a rock-slide, an explosion of any sort, all of them make the same kind of waves! All have compression phases, then rarefaction phases, then compression phases, and so on. What " his voice was plaintive "what in hell is this?"
This strange phenomenon was due to mirage or refraction. We attributed it to an ice-crack to the westward, where the band of open water had heated a stratum of air. The drift of the pack was not constant, and during the succeeding days the crevassed berg alternately advanced and receded as the 'Endurance' moved with the floe. On Sunday, April 18, it was only seven miles distant from the ship.
No European could have made five miles a day over the ice-rubbish and the sharp-edged drifts; but those two knew exactly the turn of the wrist that coaxes a sleigh round a hummock, the jerk that nearly lifts it out of an ice-crack, and the exact strength that goes to the few quiet strokes of the spear-head that make a path possible when everything looks hopeless.
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