Letter | Published:

[Letters to Editor]

Nature volume 104, pages 372373 (11 December 1919) | Download Citation



PROF. ANDERSON'S letter in NATURE of December 4 raises a point well worthy of consideration—that is, the possibility of abnormal refraction due to the lowering of temperature in the air by the passage of the shadow cone. I do not, however, think that more than a very small portion of the effect noted at Sobral could be explained in this way. The shadow ellipse was 194 miles long (direction of motion) and 137 miles broad. I have drawn a section in the former direction to scale, taking the height as 20 miles. It is certainly unnecessary to take it higher, as the temperature of the upper air is unaffected by the passage of the shadow.

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