On the Mean Density of the Earth - JSTOR

using the number 2.75 or 2-, thus 9 x 21-, which gives i9 or 4.95 for the mean density of the earth. Or, if we assume the density of the mountain still higher, as 2.8 instead of 2.75, we then obtain 9 x 2.8 = 5F.5, a little more than 5 for the earth's density; which last number 5, I therefore fix upon, ................
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