Chapter 1 The Earth

This principle could also be seen very easily by everyone in the preparation of a carriage. Someone should construct a perfectly mathematically even wagon beam from metal of as much the same density as possible, then hang it in the wagon fork, and he will see for himself that even with such a highly mathematically correct evenness, the two wagon beams, or rather the two parts of the same wagon beam, will never form a perfectly horizontal plane, but one will suggest something to the other, and the manufacturer of the scale will then have to come to the aid of the scale beam either on one side or on the other with a file or with a hammer. The cause of this, of course, lies in the above principle. – The Earth, Chapter 1, Paragraph 5

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