tudes given by Simpson in his meteorological report are of great interest: Cape Evans 0, Shambles Camp 170, Upper Glacier Depôt 7151, Three Degree Depôt 9392, One and a Half Degree Depôt 9862, South Pole 9072 feet above sea-level.[1]
What happened is not quite clear, but there is no doubt that the surface became very bad, that the party began to feel the cold, and that before long Evans especially began to crock. The immediate trouble was bad surfaces. I will try and show why these surfaces should have been met in what was, you must remember, now a land which no man had travelled before.
Scott laid his One and a Half Degree Depôt (i.e. 1½° or 90 miles from the Pole) on January 10. That day they started to go down, but for several days before that the plateau had been pretty flat. Time after time in the diaries you find crystals—crystals—crystals; crystals falling through the air, crystals bearding the sastrugi, crystals lying loose upon the snow. Sandy crystals, upon which the sun shines and which made pulling a terrible effort: when the sky clouds over they get along much better. The clouds form and disperse without visible reason. And generally the wind is in their faces.
Wright tells me that there is certain evidence in the records which may explain these crystals. Halos are caused by crystals and nearly all those logged from the bottom of the Beardmore to the Pole and back were on this stretch of country, where the land was falling. Bowers mentions that the crystals did not appear in all directions, which goes to show that the air was not always rising, but sometimes was falling and therefore not depositing its moisture. There is no doubt that the surfaces met were very variable, and it may be that the snow lay in waves. Bowers mentions big undulations for thirty miles before the Pole, and other inequalities may have been there which were not visible. There is sometimes evidence that these crystals were formed on the windward side of these waves, and carried over by a strong wind and deposited on the lee side.
- ↑ Simpson, B.A.E., 1910–1913, "Meteorology," vol. i. p. 291.
